Ch. 10 Troubleshooting Ethernet LANs Flashcards
________ refers to the follow-on process that occurs when the network is not working as designed
Troubleshooting
_____ refers to the process of confirming wether a network is working as designed
Verification
CDP
Cisco discovery protocol
______ must be in a working state before the switch will forward frames on the interface
Interfaces
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
Keeping a layer to switch focus look at what can go wrong with VLANs and VLAN _____
Trunks
The proprietary _____ discovers basic information about neighboring routers and switches without needing to know the password for the neighboring devices
CDP (Cisco discovery protocol)
LLDP
Link layer discovery protocol
From a Troubleshooting perspective _____ can be used to either confirm or fix the documentation shown and the network diagram
CDP
____ _____ is typically the host name
Device identifier
_____ _____ is a networking data link addresses
Address list
_____ _____ The interface on the remote router or switch on the other end of the link that sent the CDP advertisement
Port identifier
_____ ____ is information of what type of device it is for example a router or switch
Capabilities list
Is the model and OS level running on the
Platform
_____ Defines protocol messages that flow between devices
CDP
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)
2
Two codes are named the ____ status and ____ status
Line and protocol
The statuses are usually shown in the interface with both codes with either an ___ or ____ status
Up or down
Any interface status other then _____ or ___/____ means that the switch will not forward or receive frames on the interface
Connected
Up/up
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
