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30 Cards in this Set
- Front
- Back
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Why does Cisco add a Type field to HLDC headers? |
To allow it to transport IPv6 packets |
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What is the default data link protocol on serial interfaces? |
HLDC |
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What is the main alternative to HLDC? |
PPP |
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Does PPP support asynchronous links? |
Yes |
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What 2 authentication protocols does PPP support? |
Password Authentication Protocol (PAP) and Challenge Handshake Authentication Protocol (CHAP) |
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What 2 types of control protocols does PPP use? |
Link Control Protocol (LCP) and Network Control Protocols (NCP) |
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How many instances of LCP does PPP use? |
1 |
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How many instances of NCP does PPP use? |
1 per Layer 3 protocol on interface |
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What is the primary difference between PAP and CHAP? |
CHAP hashes the password instead of sending it in cleartext |
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What 2 pieces of information does CHAP use to create the hash? |
The password and a shared number (sent in original challenge) |
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What command needs to be run to set PPP on a serial link? |
"Encapsulation ppp" on both interfaces on link |
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What command will show that HLDC or PPP encapsulation is set on an interface? |
Show interfaces |
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Does a router require a host name for CHAP? Why or why not? |
Yes- it is the used as the username for the neighboring router |
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What command sets CHAP authentication for PPP? |
ppp authentication chap |
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What command will configure CHAP username/password for PPP? |
username <hostname> password <shared_password> |
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Does the password for CHAP need to be identical between neighbors? |
Yes |
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What command will show the details of PPP configuration? |
show ppp all |
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What does multilink PPP do? |
Treats multiple parallel serial links as a single L3 link |
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How does multilink PPP handle load balancing? |
It breaks a frame into multiple smaller frames (I per channel) |
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What command is used to create a multilink interface? |
Interface multilink <#> |
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Does a multilink interface number need to be the same on both ends of a link? |
Yes |
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What command is used to add an interface to a multilink interface? |
Ppp multilink group <#> |
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What 2 interfaces must "ppp multilink group <#>" be run on to link a physical interface to a multilink interface? |
The physical interface and the multilink interface |
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For a multilink interface, should L3 commands (ip address, etc.) be run on the physical or multilink interface? |
Multilink interface |
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What is the likely problem for WAN encapsulation if the line is up on both ends, but the protocol is flapping? |
Mismatched encapsulation |
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What line/protocol status likely indicates an encapsulation mismatch on WAN encapsulation? |
Line up on both ends, but protocol flapping |
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What WAN encapsulation problem will lead to the line showing as up, but the protocol down at one end? |
Keepalive disabled on the end where protocol is up |
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What will line/protocol show if the keepalive is disabled on one end of an HLDC tunnel? |
The line will be us, but protocol will be down on the line with the keepalive set |
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What WAN encapsulation problem will cause the line to show as up, but protocol as down on both ends? |
failed PAP/CHAP authentication |
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What will the line/protocol status be if PAP/CHAP authentication fails on a PPP tunnel? |
Line up, protocol down on both ends |
