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350-027 - CCIE Written: Metro Ethernet - Dump Information

Vendor : Cisco
Exam Code : 350-027
Exam Name : CCIE Written: Metro Ethernet
Questions and Answers : 400 Q & A
Updated On : April 19, 2019
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350-027 Questions and Answers

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350-027 CCIE Written: Metro Ethernet

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350-027 exam Dumps Source : CCIE Written: Metro Ethernet

Test Code : 350-027
Test Name : CCIE Written: Metro Ethernet
Vendor Name : Cisco
Q&A : 400 Real Questions

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Cisco CCIE Written: Metro Ethernet

Chapter 1: Ethernet fundamentals | killexams.com Real Questions and Pass4sure dumps

Blueprint subject matters covered in this chapter:

This chapter covers here subtopics from the Cisco CCIE Routing and Switching written exam blueprint. discuss with the entire blueprint in desk I-1 within the Introduction for extra particulars on the themes lined in each chapter and their context inside the blueprint.

  • LAN Switching

  • Ethernet

  • velocity

  • Duplex

  • Unicast Flooding

  • speedy Ethernet

  • Gigabit Ethernet

  • it be no surprise that the concepts, protocols, and commands related to Ethernet are a key a part of the CCIE Routing and Switching written examination. just about all campus networks today are developed the usage of Ethernet technology. additionally, Ethernet technology is moving into the WAN with the emergence of metro Ethernet. Even in an IT world, where technology changes swiftly, which you could are expecting that ten years from now, Ethernet will nonetheless be a vital a part of the CCIE Routing and Switching written and lab exams.

    For this chapter, if I had to undertaking a wager, probably 100% of you reading this e-book know a fair quantity about Ethernet fundamentals already. I have to admit, i was tempted to leave it out. youngsters, i would also undertaking a bet that at least a few of you have got forgotten a couple of records about Ethernet. so that you can study the total chapter if your Ethernet recollections are a little bit fuzzy—otherwise you might simply hit the highlights. For examination preparation, it's customarily positive to use the entire refresher tools: take the "Do i do know This Already?" quiz, finished the definitions of the terms listed at the end of the chapter, print and complete the tables in Appendix E, "Key Tables for CCIE study," and positively answer all of the CD-ROM questions regarding Ethernet.

    "Do i know This Already?" Quiz

    table 1-1 outlines the foremost headings during this chapter and the corresponding "Do i know This Already?" quiz questions.

    desk 1-1 "Do i do know This Already?" groundwork topics section-to-question Mapping

    groundwork topics part

    Questions coated during this part

    score

    Ethernet Layer 1: Wiring, speed, and Duplex

    1–5

     

    Ethernet Layer 2: Framing and Addressing

    6–7

     

    Switching and Bridging logic

    eight

     

    complete rating

       

    as a way to most advantageous use this pre-chapter assessment, bear in mind to score yourself strictly. that you can discover the solutions in Appendix A, "solutions to the 'Do i know This Already?' Quizzes."

  • Which of right here denotes the suitable usage of pins on the RJ-forty five connectors on the opposite ends of an Ethernet cross-over cable?

  • 1 to 1

  • 1 to 2

  • 1 to three

  • 6 to 1

  • 6 to 2

  • 6 to three

  • Which of the following denotes the proper utilization of pins on the RJ-45 connectors on the opposite ends of an Ethernet straight-through cable?

  • 1 to 1

  • 1 to 2

  • 1 to 3

  • 6 to 1

  • 6 to 2

  • 6 to three

  • Which of the following commands have to be configured on a Cisco IOS switch interface to disable Ethernet auto-negotiation?

  • no auto-negotiate

  • no auto

  • both pace and duplex

  • duplex

  • velocity

  • believe an Ethernet go-over cable between two 10/100 ports on Cisco switches. One change has been configured for 100-Mbps full duplex. Which of here is true in regards to the different switch?

  • it's going to use a pace of 10 Mbps.

  • it will use a speed of 100 Mbps.

  • it will use a duplex atmosphere of half duplex.

  • it's going to use a duplex environment of full duplex.

  • believe an Ethernet go-over cable between two 10/a hundred/1000 ports on Cisco switches. One switch has been configured for half duplex, and the different for full duplex. The ports effectively negotiate a velocity of 1 Gbps. Which of right here might occur as a result of the duplex mismatch?

  • No frames may also be obtained via the half-duplex swap without it believing an FCS error has befell.

  • CDP would discover the mismatch and alter the total-duplex change to half duplex.

  • CDP would realize the mismatch and subject a log message to that impact.

  • The half-duplex switch will erroneously believe collisions have happened.

  • Which of here Ethernet header category fields is a 2-byte container?

  • DSAP

  • class (in SNAP header)

  • category (in Ethernet V2 header)

  • LLC manage

  • Which of right here requisites defines a fast Ethernet commonplace?

  • IEEE 802.1Q

  • IEEE 802.3U

  • IEEE 802.1X

  • IEEE 802.3Z

  • IEEE 802.3AB

  • IEEE 802.1AD

  • consider a brand-new Cisco IOS–based mostly swap has simply been taken out of the field and cabled to a few devices. one of the crucial contraptions sends a body. For which of right here locations would a switch flood the frames out all ports (except the port upon which the body became received)?

  • declares

  • Unknown unicasts

  • popular unicasts

  • Multicasts

  • groundwork topics Ethernet Layer 1: Wiring, pace, and Duplex

    earlier than making an Ethernet LAN practical, conclusion-person instruments, routers, and switches ought to be cabled appropriately. To run with fewer transmission errors at bigger speeds, and to assist longer cable distances, variations of copper and optical cabling will also be used. The distinctive Ethernet specifications, cable kinds, and cable lengths per the quite a lot of specifications are essential for the examination, and are listed in the "basis summary" section.

    RJ-forty five Pinouts and class 5 Wiring

    be sure you comprehend the particulars of pass-over and straight-through category 5 (Cat 5) or Cat 5e cabling for most any networking job. The EIA/TIA defines the cabling specifications for Ethernet LANs (http://www.eia.org and http://www.tiaonline.org), together with the pinouts for the RJ-forty five connects, as proven in figure 1-1.

    determine 1-1

    RJ-45 Pinouts with four-Pair UTP Cabling

    the most usual Ethernet standards (10BASE-T and 100BASE-TX) each use two twisted pairs (exceptionally pairs 2 and 3 shown in determine 1-1), with one pair used for transmission in each direction. reckoning on which pair a tool uses to transmit and get hold of, both a straight-through or go-over cable is required. table 1-2 summarizes how the cabling and pinouts work.

    table 1-2 Ethernet Cabling varieties

    class of Cable

    Pinouts

    Key Pins linked

    Straight-through

    T568A (both ends) or T568B (both ends)

    1 – 1; 2 – 2; three – three; 6 – 6

    move-over

    T568A on one conclusion, T568B on the different

    1 – 3; 2 – 6; three – 1; 6 – 2

    Many Ethernet necessities use two twisted pairs, with one pair being used for transmission in each and every route. for instance, a pc network interface card (NIC) transmits on pair 1,2 and receives on pair three,6; swap ports do the contrary. So, a straight-through cable works neatly, connecting pair 1,2 on the workstation (pc transmit pair) to the change port's pair 1,2, on which the change receives. When the two instruments on the ends of the cable both transmit the usage of the equal pins, a pass-over cable is required. as an instance, if two connected switches ship using the pair at pins 3,6 and get hold of on pins 1,2, then the cable needs to join the pair at 3,6 on one end to pins 1,2 on the other end, and vice versa.

    be aware - move-over cables can also be used between a pair of PCs, swapping the transmit pair on one conclusion (1,2) with the get hold of pins on the different end (3,6).

    Cisco also supports a swap feature that lets the swap determine if the wrong cable is put in: Auto-MDIX (computerized medium-elegant interface crossover) detects the incorrect cable and motives the switch to swap the pair it makes use of for transmitting and receiving, which solves the cabling problem. (As of booklet, this characteristic is not supported on all Cisco change fashions.)

    Auto-negotiation, pace, and Duplex

    by way of default, each and every Cisco switch port uses Ethernet auto-negotiation to assess the pace and duplex setting (half or full). The switches can also set their duplex atmosphere with the duplex interface subcommand, and their speed with—you guessed it—the speed interface subcommand.

    Switches can dynamically observe the velocity surroundings on a particular Ethernet segment by using a few different methods. Cisco switches (and a lot of other gadgets) can experience the velocity using theFast hyperlink Pulses (FLP) of the auto-negotiation procedure. although, if auto-negotiation is disabled on both end of the cable, the swap detects the pace anyway based on the incoming electrical signal. that you may force a speed mismatch through statically configuring distinctive speeds on both end of the cable, inflicting the link to not characteristic.

    Switches observe duplex settings via auto-negotiation handiest. If both ends have auto-negotiation enabled, the duplex is negotiated. youngsters, if either gadget on the cable disables auto-negotiation, the instruments with no configured duplex surroundings need to expect a default. Cisco switches use a default duplex surroundings of half duplex (HDX) (for 10-Mbps and a hundred-Mbps interfaces) or full duplex (FDX) (for one thousand-Mbps interfaces). To disable auto-negotiation on a Cisco swap port, you easily deserve to statically configure the velocity and the duplex settings.

    Ethernet devices can use FDX best when collisions can not happen on the attached cable; a collision-free hyperlink can be assured simplest when a shared hub is not in use. The following few themes assessment how Ethernet offers with collisions after they do happen, in addition to what is different with Ethernet good judgment in situations where collisions cannot occur and FDX is allowed.

    CSMA/CD

    The original Ethernet requisites expected collisions to ensue on the LAN. The media was shared, making a literal electrical bus. Any electrical signal triggered onto the wire might collide with a sign triggered by an extra equipment. When two or more Ethernet frames overlap on the transmission medium at the identical instant in time, a collision occurs; the collision effects in bit mistakes and lost frames.

    The common Ethernet standards described the carrier experience dissimilar entry with Collision Detection (CSMA/CD) algorithm to cope with the inevitable collisions. CSMA/CD minimizes the variety of collisions, however after they ensue, CSMA/CD defines how the sending stations can recognize the collisions and retransmit the frame. right here listing outlines the steps within the CSMA/CD process:

  • a tool with a body to send listens unless the Ethernet isn't busy (in different phrases, the equipment can not feel a provider sign on the Ethernet section).

  • When the Ethernet isn't busy, the sender begins sending the frame.

  • The sender listens to be certain that no collision passed off.

  • If there turned into a collision, all stations that despatched a frame ship a jamming sign to ensure that all stations admire the collision.

  • After the jamming is complete, every sender of 1 of the customary collided frames randomizes a timer and waits that lengthy before resending. (other stations that didn't create the collision should not have to wait to ship.)

  • after all timers expire, the common senders can start once again with Step 1.

  • Collision Domains and switch Buffering

    A collision domain is a collection of gadgets that can ship frames that collide with frames sent by a further gadget in that same set of gadgets. earlier than the advent of LAN switches, Ethernets had been both bodily shared (10BASE2 and 10BASE5) or shared by virtue of shared hubs and their Layer 1 "repeat out all other ports" common sense. Ethernet switches greatly in the reduction of the variety of viable collisions, each via frame buffering and through their greater comprehensive Layer 2 common sense.

    by means of definition of the term, Ethernet hubs:

  • function fully at Ethernet Layer 1

  • Repeat (regenerate) electrical indicators to enhance cabling distances

  • ahead signals acquired on a port out all other ports (no buffering)

  • because of a hub's common sense, a hub creates a single collision area. Switches, although, create a special collision domain per change port, as shown in determine 1-2.

    determine 1-2

    Collision Domains with Hubs and Switches

    Switches have the same cabling and signal regeneration merits as hubs, however switches do much more—including every so often reducing or even doing away with collisions with the aid of buffering frames. When switches get hold of multiple frames on different swap ports, they save the frames in memory buffers to avoid collisions.

    for example, imagine that a switch receives three frames on the identical time, getting into three distinctive ports, and that they all have to exit the identical switch port. The change without problems outlets two of the frames in memory, forwarding the frames sequentially. due to this fact, in figure 1-2, the switch prevents any body sent by Larry from colliding with a body sent via Archie or Bob—which through definition puts each of the PCs connected to the change in determine 1-2 in distinctive collision domains.

    When a switch port connects by means of cable to a single other non-hub equipment—as an instance, just like the three PCs in determine 1-2—no collisions can maybe ensue. The only devices that may create a collision are the change port and the one related equipment—and that they every have a separate twisted pair on which to transmit. as a result of collisions can not ensue, such segments can use full-duplex common sense.

    When a switch port connects to a hub, it must operate in HDX mode, because collisions could turn up as a result of the good judgment used with the aid of the hub.

    be aware - NICs working in HDX mode use loopback circuitry when transmitting a frame. This circuitry loops the transmitted body back to the acquire aspect of the NIC, in order that when the NIC receives a body over the cable, the mixed looped-again sign and acquired signal makes it possible for the NIC to word that a collision has occurred.

    basic swap Port Configuration

    The three key configuration points on a Cisco switch port are auto-negotiation, speed, and duplex. Cisco switches use auto-negotiation via default; it is then disabled if each the pace and duplex are manually configured. that you may set the pace the use of the velocity 10 interface subcommand, assuming the interface helps multiple speeds. You configure the duplex setting using the duplex full interface subcommand.


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    choosing the right product for a department workplace: Cisco ASA or IOS Router? | killexams.com Real Questions and Pass4sure dumps

    CCIE Brandon Carroll compares the Cisco ASA and an IOS Router for connecting a small department workplace. here is the criteria he evaluates and the product that he thinks works choicest.

    have you ever had to make a call between an ASA or a Cisco IOS Router at a smaller department workplace? This appears like it will be an easy project, but it surely's now not. The ASA puts up a superb case for being the gadget of choice. Then once more, so does the Cisco IOS router. So the decision continually comes down to what an admin is greater at ease with. during this submit i am going to share why i'd selected a router, even if i am a huge fan of the ASA.

    word: For purposes of simplicity i'll be comparing the Cisco 891 built-in features Routers to the Cisco ASA 5505 but many of the aspects discussed relate to most department Routers working Cisco IOS version 12.4 or 15.x. Interfaces

    Let's beginning with interfaces. The Cisco 891 has an 8-port 10/100 fast Ethernet managed change with VLAN help and 4-port guide for vigor over Ethernet (PoE) (non-compulsory) to vigour IP phones or external entry element. The Cisco ASA 5505 has eight port 10/100 switch with best 2 PoE ports.

    The Cisco 891 has Metro Ethernet features which include one 1000BASE-T Gigabit Ethernet WAN port, one 10/100BASE-T speedy Ethernet WAN port, or one 1-port Gigabit Ethernet (GE) Small kind-component Pluggable (SFP) socket for WAN connectivity besides the fact that children best the 1000BASE-T Gigabit Ethernet WAN or the SFP can also be operational at any given time.

    The Cisco ASA 5505 would not have any of this functionality, therefore this circular goes to the Cisco 891.

    QoS

    next, let's discuss QoS aspects. The Cisco ASA is capable of some QOS facets configurable with the Modular coverage Framework. This comprises policing on inbound and outbound as well as the ability to configure a precedence queue apart from the single choicest effort queue. Matching capabilities are still immature on the Cisco ASA OS. The Cisco 891 is feature-prosperous with QoS being in a position to distinct classification methods, diverse queuing strategies, site visitors policing, site visitors shaping, and even auto qos. When it involves QoS, the Cisco 891 wins once more.

    The Cisco 891 helps a few protocols based mostly around Metro Ethernet but given that the ASA does not support them, there isn't any use in mentioning them.

    The Cisco 891 also has an optional built-in comfy 802.11a/g/n access element it's in line with the draft 802.11n regular in addition to twin-band radios for mobility and guide for self reliant or Cisco Unified WLAN architectures. here's an additional enviornment where the Cisco ASA 5505 cannot touch the router.

    You may additionally additionally want to believe routing functionality when making a decision like this. whereas the ASA 5505 does definitely support routing protocols, it by no capability compares to the routing skill of the Cisco IOS.

    but you may be attracted to protection, because this is the simple function of the 5505. while the 5505 definitely is able to every little thing a firewall will also be after which some, there's a "no longer-so-normal" function of the Cisco IOS known as Zone based policy Firewalls. this is a very characteristic-packed firewall potential. i can pretty a lot do the rest with the Zone primarily based Firewalls that i will do with an ASA.

    and at last to round issues off with VPN capability, I again have to go together with a Cisco Router. The main cause of here's DMVPN. there's effortlessly no DMVPN capability in the ASA, doubtless since it would not guide GRE tunnels. DMVPN is a superb answer for connecting branches the usage of the critical web site because the hub and simplest constructing the tunnels between branches on the fly when they are crucial. With an ASA the tunnel would should stay up, otherwise you would need to hairpin by means of the critical web site through which you'll want a bit more configuration on the principal site to enable the hairpinning.

    So while I stress the undeniable fact that i'm partial to the Cisco ASA platform, i would take a Cisco Router on the branch any day. What other criteria would you utilize to make an analogous resolution?


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    CCIE Written: Metro Ethernet

    Pass 4 sure 350-027 dumps | Killexams.com 350-027 real questions | [HOSTED-SITE]

    Chapter 1: Ethernet Basics | killexams.com real questions and Pass4sure dumps

    Blueprint topics covered in this chapter:

    This chapter covers the following subtopics from the Cisco CCIE Routing and Switching written exam blueprint. Refer to the full blueprint in Table I-1 in the Introduction for more details on the topics covered in each chapter and their context within the blueprint.

  • LAN Switching

  • Ethernet

  • Speed

  • Duplex

  • Unicast Flooding

  • Fast Ethernet

  • Gigabit Ethernet

  • It's no surprise that the concepts, protocols, and commands related to Ethernet are a key part of the CCIE Routing and Switching written exam. Almost all campus networks today are built using Ethernet technology. Also, Ethernet technology is moving into the WAN with the emergence of metro Ethernet. Even in an IT world, where technology changes rapidly, you can expect that ten years from now, Ethernet will still be an important part of the CCIE Routing and Switching written and lab exams.

    For this chapter, if I had to venture a guess, probably 100 percent of you reading this book know a fair amount about Ethernet basics already. I must admit, I was tempted to leave it out. However, I would also venture a guess that at least some of you have forgotten a few facts about Ethernet. So you can read the whole chapter if your Ethernet recollections are a bit fuzzy—or you could just hit the highlights. For exam preparation, it is typically useful to use all the refresher tools: take the "Do I Know This Already?" quiz, complete the definitions of the terms listed at the end of the chapter, print and complete the tables in Appendix E, "Key Tables for CCIE Study," and certainly answer all the CD-ROM questions concerning Ethernet.

    "Do I Know This Already?" Quiz

    Table 1-1 outlines the major headings in this chapter and the corresponding "Do I Know This Already?" quiz questions.

    Table 1-1 "Do I Know This Already?" Foundation Topics Section-to-Question Mapping

    Foundation Topics Section

    Questions Covered in This Section

    Score

    Ethernet Layer 1: Wiring, Speed, and Duplex

    1–5

     

    Ethernet Layer 2: Framing and Addressing

    6–7

     

    Switching and Bridging Logic

    8

     

    Total Score

       

    In order to best use this pre-chapter assessment, remember to score yourself strictly. You can find the answers in Appendix A, "Answers to the 'Do I Know This Already?' Quizzes."

  • Which of the following denotes the correct usage of pins on the RJ-45 connectors at the opposite ends of an Ethernet cross-over cable?

  • 1 to 1

  • 1 to 2

  • 1 to 3

  • 6 to 1

  • 6 to 2

  • 6 to 3

  • Which of the following denotes the correct usage of pins on the RJ-45 connectors at the opposite ends of an Ethernet straight-through cable?

  • 1 to 1

  • 1 to 2

  • 1 to 3

  • 6 to 1

  • 6 to 2

  • 6 to 3

  • Which of the following commands must be configured on a Cisco IOS switch interface to disable Ethernet auto-negotiation?

  • no auto-negotiate

  • no auto

  • Both speed and duplex

  • duplex

  • speed

  • Consider an Ethernet cross-over cable between two 10/100 ports on Cisco switches. One switch has been configured for 100-Mbps full duplex. Which of the following is true about the other switch?

  • It will use a speed of 10 Mbps.

  • It will use a speed of 100 Mbps.

  • It will use a duplex setting of half duplex.

  • It will use a duplex setting of full duplex.

  • Consider an Ethernet cross-over cable between two 10/100/1000 ports on Cisco switches. One switch has been configured for half duplex, and the other for full duplex. The ports successfully negotiate a speed of 1 Gbps. Which of the following could occur as a result of the duplex mismatch?

  • No frames can be received by the half-duplex switch without it believing an FCS error has occurred.

  • CDP would detect the mismatch and change the full-duplex switch to half duplex.

  • CDP would detect the mismatch and issue a log message to that effect.

  • The half-duplex switch will erroneously believe collisions have occurred.

  • Which of the following Ethernet header type fields is a 2-byte field?

  • DSAP

  • Type (in SNAP header)

  • Type (in Ethernet V2 header)

  • LLC Control

  • Which of the following standards defines a Fast Ethernet standard?

  • IEEE 802.1Q

  • IEEE 802.3U

  • IEEE 802.1X

  • IEEE 802.3Z

  • IEEE 802.3AB

  • IEEE 802.1AD

  • Suppose a brand-new Cisco IOS–based switch has just been taken out of the box and cabled to several devices. One of the devices sends a frame. For which of the following destinations would a switch flood the frames out all ports (except the port upon which the frame was received)?

  • Broadcasts

  • Unknown unicasts

  • Known unicasts

  • Multicasts

  • Foundation Topics Ethernet Layer 1: Wiring, Speed, and Duplex

    Before making an Ethernet LAN functional, end-user devices, routers, and switches must be cabled correctly. To run with fewer transmission errors at higher speeds, and to support longer cable distances, variations of copper and optical cabling can be used. The different Ethernet specifications, cable types, and cable lengths per the various specifications are important for the exam, and are listed in the "Foundation Summary" section.

    RJ-45 Pinouts and Category 5 Wiring

    You should know the details of cross-over and straight-through Category 5 (Cat 5) or Cat 5e cabling for most any networking job. The EIA/TIA defines the cabling specifications for Ethernet LANs (http://www.eia.org and http://www.tiaonline.org), including the pinouts for the RJ-45 connects, as shown in Figure 1-1.

    Figure 1-1

    RJ-45 Pinouts with Four-Pair UTP Cabling

    The most popular Ethernet standards (10BASE-T and 100BASE-TX) each use two twisted pairs (specifically pairs 2 and 3 shown in Figure 1-1), with one pair used for transmission in each direction. Depending on which pair a device uses to transmit and receive, either a straight-through or cross-over cable is required. Table 1-2 summarizes how the cabling and pinouts work.

    Table 1-2 Ethernet Cabling Types

    Type of Cable

    Pinouts

    Key Pins Connected

    Straight-through

    T568A (both ends) or T568B (both ends)

    1 – 1; 2 – 2; 3 – 3; 6 – 6

    Cross-over

    T568A on one end, T568B on the other

    1 – 3; 2 – 6; 3 – 1; 6 – 2

    Many Ethernet standards use two twisted pairs, with one pair being used for transmission in each direction. For instance, a PC network interface card (NIC) transmits on pair 1,2 and receives on pair 3,6; switch ports do the opposite. So, a straight-through cable works well, connecting pair 1,2 on the PC (PC transmit pair) to the switch port's pair 1,2, on which the switch receives. When the two devices on the ends of the cable both transmit using the same pins, a cross-over cable is required. For instance, if two connected switches send using the pair at pins 3,6 and receive on pins 1,2, then the cable needs to connect the pair at 3,6 on one end to pins 1,2 at the other end, and vice versa.

    Note - Cross-over cables can also be used between a pair of PCs, swapping the transmit pair on one end (1,2) with the receive pins at the other end (3,6).

    Cisco also supports a switch feature that lets the switch figure out if the wrong cable is installed: Auto-MDIX (automatic medium-dependent interface crossover) detects the wrong cable and causes the switch to swap the pair it uses for transmitting and receiving, which solves the cabling problem. (As of publication, this feature is not supported on all Cisco switch models.)

    Auto-negotiation, Speed, and Duplex

    By default, each Cisco switch port uses Ethernet auto-negotiation to determine the speed and duplex setting (half or full). The switches can also set their duplex setting with the duplex interface subcommand, and their speed with—you guessed it—the speed interface subcommand.

    Switches can dynamically detect the speed setting on a particular Ethernet segment by using a few different methods. Cisco switches (and many other devices) can sense the speed using theFast Link Pulses (FLP) of the auto-negotiation process. However, if auto-negotiation is disabled on either end of the cable, the switch detects the speed anyway based on the incoming electrical signal. You can force a speed mismatch by statically configuring different speeds on either end of the cable, causing the link to no longer function.

    Switches detect duplex settings through auto-negotiation only. If both ends have auto-negotiation enabled, the duplex is negotiated. However, if either device on the cable disables auto-negotiation, the devices without a configured duplex setting must assume a default. Cisco switches use a default duplex setting of half duplex (HDX) (for 10-Mbps and 100-Mbps interfaces) or full duplex (FDX) (for 1000-Mbps interfaces). To disable auto-negotiation on a Cisco switch port, you simply need to statically configure the speed and the duplex settings.

    Ethernet devices can use FDX only when collisions cannot occur on the attached cable; a collision-free link can be guaranteed only when a shared hub is not in use. The next few topics review how Ethernet deals with collisions when they do occur, as well as what is different with Ethernet logic in cases where collisions cannot occur and FDX is allowed.

    CSMA/CD

    The original Ethernet specifications expected collisions to occur on the LAN. The media was shared, creating a literal electrical bus. Any electrical signal induced onto the wire could collide with a signal induced by another device. When two or more Ethernet frames overlap on the transmission medium at the same instant in time, a collision occurs; the collision results in bit errors and lost frames.

    The original Ethernet specifications defined the Carrier Sense Multiple Access with Collision Detection (CSMA/CD) algorithm to deal with the inevitable collisions. CSMA/CD minimizes the number of collisions, but when they occur, CSMA/CD defines how the sending stations can recognize the collisions and retransmit the frame. The following list outlines the steps in the CSMA/CD process:

  • A device with a frame to send listens until the Ethernet is not busy (in other words, the device cannot sense a carrier signal on the Ethernet segment).

  • When the Ethernet is not busy, the sender begins sending the frame.

  • The sender listens to make sure that no collision occurred.

  • If there was a collision, all stations that sent a frame send a jamming signal to ensure that all stations recognize the collision.

  • After the jamming is complete, each sender of one of the original collided frames randomizes a timer and waits that long before resending. (Other stations that did not create the collision do not have to wait to send.)

  • After all timers expire, the original senders can begin again with Step 1.

  • Collision Domains and Switch Buffering

    A collision domain is a set of devices that can send frames that collide with frames sent by another device in that same set of devices. Before the advent of LAN switches, Ethernets were either physically shared (10BASE2 and 10BASE5) or shared by virtue of shared hubs and their Layer 1 "repeat out all other ports" logic. Ethernet switches greatly reduce the number of possible collisions, both through frame buffering and through their more complete Layer 2 logic.

    By definition of the term, Ethernet hubs:

  • Operate solely at Ethernet Layer 1

  • Repeat (regenerate) electrical signals to improve cabling distances

  • Forward signals received on a port out all other ports (no buffering)

  • As a result of a hub's logic, a hub creates a single collision domain. Switches, however, create a different collision domain per switch port, as shown in Figure 1-2.

    Figure 1-2

    Collision Domains with Hubs and Switches

    Switches have the same cabling and signal regeneration benefits as hubs, but switches do a lot more—including sometimes reducing or even eliminating collisions by buffering frames. When switches receive multiple frames on different switch ports, they store the frames in memory buffers to prevent collisions.

    For instance, imagine that a switch receives three frames at the same time, entering three different ports, and they all must exit the same switch port. The switch simply stores two of the frames in memory, forwarding the frames sequentially. As a result, in Figure 1-2, the switch prevents any frame sent by Larry from colliding with a frame sent by Archie or Bob—which by definition puts each of the PCs attached to the switch in Figure 1-2 in different collision domains.

    When a switch port connects via cable to a single other non-hub device—for instance, like the three PCs in Figure 1-2—no collisions can possibly occur. The only devices that could create a collision are the switch port and the one connected device—and they each have a separate twisted pair on which to transmit. Because collisions cannot occur, such segments can use full-duplex logic.

    When a switch port connects to a hub, it needs to operate in HDX mode, because collisions might occur due to the logic used by the hub.

    Note - NICs operating in HDX mode use loopback circuitry when transmitting a frame. This circuitry loops the transmitted frame back to the receive side of the NIC, so that when the NIC receives a frame over the cable, the combined looped-back signal and received signal allows the NIC to notice that a collision has occurred.

    Basic Switch Port Configuration

    The three key configuration elements on a Cisco switch port are auto-negotiation, speed, and duplex. Cisco switches use auto-negotiation by default; it is then disabled if both the speed and duplex are manually configured. You can set the speed using the speed {auto | 10 | 100 | 1000} interface subcommand, assuming the interface supports multiple speeds. You configure the duplex setting using the duplex {auto | half | full} interface subcommand.


    CCIE relevancy: Is Cisco's venerable network certification on top of programmability, automation trends? | killexams.com real questions and Pass4sure dumps

    No result found, try new keyword!Keeping the CCIE relevant is a priority for Cisco and its training team. In 2016, Cisco added an emerging technologies track to the written portion of its CCIE ... and sharing the results of a lab on ...

    AboveNet Extends Metro Ethernet Network to Telx in Dallas | killexams.com real questions and Pass4sure dumps

  • Written by
  • Telx was recently selected by AboveNet to house a new point of presence, or PoP, in Dallas.

    AboveNet will expand its metro Ethernet network to Telx’s facility at 8435 Stemmons Freeway, allowing customers to link to AboveNet’s metro Ethernet network throughout Texas. The addition of this PoP will also provide customers with connectivity to AboveNet’s long-haul network so that customers can link to other corporate locations.

    Related
  • Charter Bumps Verizon, Chases AT&T, Level 3 in Ethernet

    Charter Communications took third in a recent ranking of Ethernet service providers, buoyed by its acquisition of Time Warner Cable and Bright House Networks.

  • BCN's Frontier Ethernet Offer Now Includes Former Verizon Territory

    BCN also is reducing the price and adding two bandwidth speed options.

  • WTG Joins Alpheus' Channel Program

    Alpheus will help WTG deliver networking solutions for voice, data and video transport, and connectivity to 20 key data centers in Texas.

  • Huawei Surges, Cisco Recovers in Ethernet Switch Sales

    Partners can find good news in a new report that says global Ethernet switch sales surged 5 percent last year over 2013.



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    Cisco 350-027 Exam (CCIE Written: Metro Ethernet) Detailed Information



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