Searching for "loopback"

Q:

You want to ping the loopback address of your IPv6 local host. What will you type?

A) Ping 127.0.0.1 B) Ping 0.0.0.0
C) Ping ::1 D) trace 0.0. :: 1
 
Answer & Explanation Answer: C) Ping ::1

Explanation:

The loop back address with IPv4 is 127.0.0.1 . With IPv6, that address is ::1

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Q:

If routers in a single area are configured with the same priority value, what value does a router use for the OSPF Router ID in the absence of a  loopback interface?

A) The Lowest IP address of any physical interface B) The Highest IP address of any physical interface
C) The Lowest IP address of any logical interface D) The Highest IP address of any logical interface
 
Answer & Explanation Answer: B) The Highest IP address of any physical interface

Explanation:

At the moment of OSPF process startup, the highest IP address on any active interface will be the Router ID (RID) of the router . If you have a loopback interface configured (logical interface), then that will override the interface IP address and become the RID of the router automatically.

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Q:

When a ping to the loopback address fails , what can you assume?

A) The IP address of the local host is incorrect B) The IP address of the remote host is incorrect
C) The NIC is not functional D) The IP stack has failed to initialize
 
Answer & Explanation Answer: D) The IP stack has failed to initialize

Explanation:

When a ping to the loopback address fails , you can assume the IP stack has failed to initialize.

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Q:

Which two descriptions are correct about characteristics of IPv6 unicast addressing? (Choose two)

A. Global addresses start with 2000::/3.
B. Link-local addresses start with FF00::/10.
C. Link-local addresses start with FE00:/12.
D. There is only one loopback address and it is ::1.

Answer

Answer : A , D


Explanation:


An IPv6 Unicast address identifies a single network interface. The Internet Protocol delivers packets sent to a unicast address to that specific interface.

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Subject: CCNA

Q:

Assume a router has a loopback address of 135.77.9.254. Convert the loopback address to an IS-IS system ID.

Answer

The loopback address written in dotted decimal and using three digits for each byte has a value of 135.077.009.254. The system ID is 13.50.77.00.92.54.

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Subject: CCNP