Which of the following statements regarding BGP route summarization is true? (Choose two.)

Routes in the local BGP routing table can be manually aggregated.
After the aggregate ipv4-address mask command is configured, only summary routes are advertised and specific routes are not advertised.
By default, automatic BGP route summarization is enabled.
BGP supports manual aggregate and automatic summarization of IPv6 routes.

Answer(s): A,D

The IS-IS overload bit is set on R3. Which of the following statements are true? (Choose three.)

Before the timeout of the overload timer on R3, R1 and R2 do not add the LSPs generated by R3 to the SPF tree.
The direct route of R3 is ignored by R1 and R2 due to the setting of the overload bit.
LSPs of R3 cannot be flooded to R1 and R2.
Routes imported to R3 through the import-route command cannot be advertised.

Answer(s): A,C,D

Which of the following statements regarding CHAP authentication in the PPP protocol are true? (Choose three.)

If no user name is configured for the authenticated party, the password does not need to be configured on the interface of the authenticated party.
The MD5 algorithm is used to calculate a hash based on the authentication sequence ID, a random number, and the key.
Authentication requires three-way handshake. Only the user name is transmitted on the network, not the password.
The user name must be configured on the interface of the authenticated party.

Answer(s): B,C,D

Which of the following statements regarding 802.1s deployment is true?

Answer(s): B

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