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Let's get to today's exam!
1. Which statements are true regarding this interface-level frame relay command?
frame map ip 172.12.123.2 122
A. The command is incomplete and will not be accepted by the router.
B. The command is legal.
C. The "122" is the local router's DLCI.
D. The IP address shown belongs to the local router.
2. Convert the hex value 341 to decimal.
3. Compress the following IPv6 address as tightly as possible.
1111:2132:0000:0000:0313:2310:0111:0000
4. You want to prevent non-secure remote connections to your local router's VTY lines, but still allow secure connections. Which of the following options could you use with the transport input command?
A. telnet
B. SSH
C. all
D. none
5. Which of the following are used by both EIGRP for IPv4 and IPv6?
A. The auto-summary command
B. The network command
C. Autonomous System numbers
D. All of the above
Answer and explanations right after this brief, important message!
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And now... the answers!
1. "B, C". That frame relay map command is legal, but you might want to add the word broadcast to the end. Otherwise, the mapping won't work for broadcast and multicast traffic.
The DLCI in that command is always the local router's DLCI, and the IP address shown is the remote router. (At least it should be if you want it to work!)
2. Converting the hex value 341 to decimal, we have 3 units of 256, 4 units of 16, and 1 unit of 1.
768 + 64 + 1 = 833
3. The final address:
1111:2132::313:2310:111:0
From left to right:
Block "1111" can't be compressed.
Block "2132" can't be compressed.
Using zero compression on the two consecutive "0000" blocks is the most efficient way to use the one zero compression opportunity we get per address.
Block "0313" can have its leading zero dropped.
Block "2310" can't be compressed.
Block "0111" can have its leading zero dropped.
Block "0000" can have its leading three zeroes dropped. (We can't use zero compression on this block, since we've already used it once in this address.)
4. "B". The only secure option there is SSH. "None" is VERY secure, but we don't want to disable remote connections entirely.
5. "C". Neither the auto-summary command nor the network command are used in EIGRP for IPv6.
Be sure to take the other CCNA practice exams I've posted here on the blog, and I'll see you on YouTube and Udemy!
Chris B.
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