Ch. 10 Troubleshooting Ethernet LANs Flashcards by Steven Wright

________ refers to the follow-on process that occurs when the network is not working as designed

Troubleshooting

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_____ refers to the process of confirming wether a network is working as designed

Verification

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CDP

Cisco discovery protocol

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______ must be in a working state before the switch will forward frames on the interface

Interfaces

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You must know how to _____ a switch’s Mac address table and how to then predict how a switch will forward a particular frame

Analyze

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Keeping a layer to switch focus look at what can go wrong with VLANs and VLAN _____

Trunks

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The proprietary _____ discovers basic information about neighboring routers and switches without needing to know the password for the neighboring devices

CDP (Cisco discovery protocol)

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LLDP

Link layer discovery protocol

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From a Troubleshooting perspective _____ can be used to either confirm or fix the documentation shown and the network diagram

CDP

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____ _____ is typically the host name

Device identifier

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_____ _____ is a networking data link addresses

Address list

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_____ _____ The interface on the remote router or switch on the other end of the link that sent the CDP advertisement

Port identifier

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_____ ____ is information of what type of device it is for example a router or switch

Capabilities list

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Is the model and OS level running on the

Platform

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_____ Defines protocol messages that flow between devices

CDP

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Cisco switches use ____ different sets of interface status codes, one set of two codes (words) that use the same conventions as do router interface status codes, and another set with a single code (word)

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Two codes are named the ____ status and ____ status

Line and protocol

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The statuses are usually shown in the interface with both codes with either an ___ or ____ status

Up or down

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Any interface status other then _____ or ___/____ means that the switch will not forward or receive frames on the interface

Connected

Up/up

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When the _____ autonegotiation process works on both devices, both devices agree to the fastest speed supported by both device

IEEE

If the speed is not known if through any means, use10 Mbps ____ _____

Half duplex

If the speed is 10 or 100 Mbps, default to use ____ ____

Half duplex

If the speed is 11,000 Mbps, default to use ____ ____

Full duplex

CRC

Cyclic redundancy check

ACL

Access control list

The Proprietary ____ discovers basic information about neighboring routers and switches without needing to know the passwords for the neighboring devices

CDP (Cisco discovery protocol)

Discover information routers and switches send ____ messages out of each of their interfaces

CDP

From the troubleshooting perspective____ can be used to either confirm or fix the documentation shown in a network diagram or even discover devices and interfaces used in the network

CDP

Device identifier, address list, port identifier, capabilities list, and platform can all be discovered using ____

CDP

The switch show interfaces and show interfaces description commands list the two code status just like routers. The two codes are named the ____ status and _____ status

Line and protocol

The ____ _____ status command lists different single interface status code, this single interface status code corresponds to different combinations of the traditional to code interface status codes and can be easily correlated to those codes

Show interfaces

Any interface state other than _____ or ___/____ means that the switch will not forward or receive frames on the interface

Connected up/up

____ Are frames that do not meet the minimum frame size requirement (64 bytes including the 18 by destination Mac source Mac type and FCS) may be caused by collisions

Runts

____ are frames that exceed the maximum frame size requirement (1518 bytes including the 18 by destination Mac, source Mac, type, and FCS)

Giants

____ A total of many counters including runts Giants no buffer CRC frame overrun and ignored counts

Input errors

____ Are received frames that did not pass the FCS math; may be caused by collisions

CRC

_____ are received frames that have an illegal format; may be caused by collision

Frames

___ are the total number of packets (frames) that the switch port tried to transmit but for which some problem occurred

Output errors

____ Are the total number of packets (frames) for the out the interface

Packet outputs

____ Are the counter of all collisions that occur when the interfaces transmitting a frame

Collisions

_____ The subset of all collisions happen after the 64th bytes of the frame has been transmitted (in a properly working ethernet LAN, collisions should occur within the first 64 bytes late collisions often point to a duplex mismatch)

Late collision

``` Imagine the switch connects through an ethernet cable to the router, and the router's host name is Hannah. Which of the following commands could tell you information about the iOS version on Hannah without establishing a telnet connection to Hannah? (choose two) Show neighbors Hannah Show CDP Show CDP neighbors Show CDP neighbors Hannah Show CDP entry Hannah Show CDP neighbors detail ```

Show CDP entry Hannah | So CDP neighbors detail

``` The switch is cabled to a router who's host name is Hannah. Which of the following CDP commands could identify hannah's model of hardware? (Choose two answers) Show neighbor Show neighbor Hannah Show CDP Show CDP Interface Show CDP neighbors Show CDP entry Hannah ```

Show CDP neighbors | Show CDP entry Hannah

The output of the show interfaces status command on the 2960 switch shows interface Fa0/1 in a "disabled" state. The following is true about interface Fa0/1(choose three answers) The interfaces configured with the shutdown command The show interfaces fa0/1 command will list the interface with two status codes of administratively down and line protocol down The show interfaces fa0/1 command list the interface with two status codes of up and down The interface cannot currently be used to forward frames The interface can currently be used Forward frames

The interfaces configured with the shutdown command The show interfaces fa0/1 command will list the interface with two status codes of administratively down and line protocol down The interface cannot currently be used forward frames

Switch SW1 uses it's gigabit 0/1 interface to connect to switch SW2's gigabit 0/2 interface. SW2's Gi0/2 interface is configured with the speed 1000 the duplex full command. SW1 uses all defaults for interface configuration commands on its Gi0/1 interface. Which of the following are true about the link after comes up? (Choose two answers) The link works at 1000 Mbps (Gbps) SW1 attempts to run at 10 Mbps because SW2 has effectively disabled IEEE standard autonegotiation The link runs at 1 Gbps, but SW1 uses half duplex and SW2 uses full-duplex Both switches use full-duplex

The link works at 1000 Mbps (1 Gbps) | Both switches use full-duplex

The following line of output was taken from a show interfaces fa0/1 command: Full – duplex, 100Mbps, media type is 10/100baseTX Which of the following are true about the interface? (Choose two answers) The speed was definitely configured with speed 100 interface subcommand The speed might have been configured with the speed 100 interface subcommand The duplex was definitely configured with the duplex full interface subcommand The duplex might have been configured with the duplex full interface subcommand

The speed might have been configured with the speed 100 interface subcommand The duplex might have been configured with the duplex full interface subcommand

``` Which of the following commands list the Mac address table entries for Mac addresses configured by port security? (Choose two answers) Show Mac address – table dynamic Show Mac address – table Show Mac address – table static Show Mac address – table port security ```

Show Mac address – table | Show Mac address – table static

``` On a Cisco catalyst switch you issue a show Mac address – table command. Which of the following answers list information you would likely see in most lines of output? (Choose two answers) Mac address IP address VLAN ID Type (broadcast, multitask, or unicast) ```

Mac address | VLAN ID

Layer 2 switches SW1 and SW2 connect through a link, with port G0/1 on SW1 and port G0/2 on SW2. Network engineer wants to use 802.1Q trunking on this link. The show interfaces g0/1 switchport command on SW1 shows the output listed here: SW1# no interfaces gigabit0/1 switchport Name: Gi0/1 Switchport: enabled Administrative mode: trunk Operational mode: trunk The following must be true on switch SW2's G0/2 port The operational state per the show interfaces switch port command must be "trunk" The administrative state per the show interfaces switch port command must be "trunk" SW2 must use the switch port mode trunk configuration command on G0/1, or the link will not use trunking SW2 can use the switch port mode dynamic auto configuration command as one option to make the link use trunking

SW2 can use the switch port mode dynamic autoconfiguration command as one option to make the link use trunking