CCNA 2 MODULE 4 Flashcards
What is Cisco Discovery Protocol (CDP)?
A Layer 2 protocol used to obtain information about neighboring devices
CDP connects lower physical media and upper network layer protocols.
Is CDP media and protocol independent?
Yes, it runs on all Cisco equipment over the Subnetwork Access Protocol (SNAP).
This allows it to function across various network environments.
What happens when a Cisco device boots up regarding CDP?
CDP starts up automatically and detects neighboring devices that are also running CDP.
What information does CDP provide about neighboring devices?
It transmits type length values (TLVs) embedded in CDP advertisements, which include:
* Device ID
* Local Interface
* Holdtime
* Capability
* Platform
* Port ID
* VTP Management Domain Name (CDPv2 only)
* Native VLAN (CDPv2 only)
* Full/Half-Duplex (CDPv2 only)
What command is used to display CDP neighbor information?
show cdp neighbors
What is the update timer for CDP?
60 seconds
What is the hold timer for CDP?
180 seconds
What commands are used to manage CDP?
- cdp run
- cdp enable
- clear cdp counters
- show cdp
- show cdp entry {|device-name[][protocol | version]}
- show cdp interface [type number]
- show cdp neighbors [type number] [detail]
True or False: If CDP is disabled globally, individual interfaces can still be enabled for CDP.
False
What is Telnet?
A virtual terminal protocol that allows connections to remote hosts.
At which layer of the OSI model does Telnet operate?
Application layer
What is the default timeout for a Telnet session?
10 minutes
How can you initiate a Telnet session?
Any of the following:
* Denver>connect paris (if DNS available)
* Denver#paris
* Denver>131.108.100.152
* Denver>telnet paris
How do you terminate a Telnet session?
Any of the following:
* Denver>disconnect paris
* Denver>exit
What is the ping command used for?
To send an echo request packet to an address and wait for a reply.
What indicates a successful echo-reply in a ping test?
A ! symbol
What does the traceroute command do?
Tests each step along the way to find where data is being sent in a network.
What does an asterisk indicate in a traceroute process?
One router is unreachable.
What is the purpose of the Ctrl-Shift-6 escape sequence?
To stop the ping or traceroute process.
What information can you gather from a running network topology?
- How devices are interconnected (physical topology)
- Device name
- Platform
- Interface name and address
