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Flashcards in Chapter 10 Deck (27):
1

CDP

Cisco Discovery Protocol. Discovers basic info about neighboring routers, switches without needing to know passwords for those devices

2

CDP works by

Devices send out advertisements with information about them. Other devices listen and take note

3

IEEE version of CDP

LLDP, Link Layer Discovery Protocol

4

What can be used to confirm or fix the documentation in a network diagram?

CDP

5

Two ways CDP sends info, depending on the medium

On ethernet, CDP uses broadcasts. On other media, CDP sends frames to any known data link address

6

Details CDP includes

Device identifier (hostname, usually)
Address list (network and data link address)
Port ID (interface that sent the CDP advertisement)
Capabilities list (information on the type of device: router, switch)
Platform (model and OS version running on the device)

7

show cdp neighbors [type number]

Lists summary line of information about each neighbor, or just the neighbor found on a specific interface, if an interface was listed

8

show cdp neighbors detail

lists one large set of info for all neighbors

9

show cdp entry [name]

lists detailed information for a specific neighbor.

10

What interfaces should have CDP enabled

Any switch port connected to another switch, a router, or an IP phone

11

Interface subcomands to disable CDP

no cdp enable

12

interface subcommands to enable CDP

cdp enable

13

global command to disable CDP for all interfaces

no cdp run

14

When an interface with autonegotation connects to an interface without autonegotiation, how does the first device determine duplex configuration

Based on speed

15

When an interface with autonegotation connects to an interface without autonegotiation, how does the first device determine duplex configuration when speed is not known

10mbps, half duplex

16

When an interface with autonegotation connects to an interface without autonegotiation, how does the first device determine duplex configuration when speed is 10 or 100 mbps

half duplex

17

When an interface with autonegotation connects to an interface without autonegotiation, how does the first device determine duplex configuration when speed is 11,000Mbps

full duplex

18

What problem could cause both ends of an ethernet segment to report up/up (connected) even when the connection doesn't work

duplex mis-match. switches still report that hte connection is up.

19

Runts

frames that did not meet the minimum frame size requirement (64 bytes, including destination/source MAC, type, and FCS). Can be caused by collissions

20

Giants

Frames that exceed the max frame size requirements (1518 bytes, including source/destination MAC, type FCS)

21

Input Errors

Total of many counters, including runts, giants, no buffer, CRC, frame, overrun, and ignored counrts

22

CRC errors

Received frames that did not pass the FCS math; can be caused by collisions

23

Frame errors

received frames that have an illegal format, for example, ending with a partial byte. Can be caused by collissions

24

Packets output

Total number of packets (frames) forwarded out the interface

25

Output Errors

Total number of packets (frames) that hte switch port tried to transmit, but for which some problem occurred

26

Collissions Counter

Counter of all collisions that occur when the interface is transmitting a frame

27

Late collisions

Subset of all collisions that happen after the 64th bytes of the frame has been transmitted (since, in a properly working ethernet LAN, collisions should occur within the first 64 bytes.). Could indicate duplex mismatch