Question 1

In BGP, the Origin attribute is used to identify the origin of a route. Which of the following statements are true about the Origin attribute?

Options :

A :

If a route is imported to BGP by the originator using the network command, the Origin attribute of the BGP route is displayed as i in the BGP routing table.

B :

If a route is learned through EGP, the Origin attribute of this BGP route is displayed as ? in the BGP routing table.

C :

If multiple routes carry the same destination address but different Origin attributes and all other route selection conditions are the same, BGP selects the optimal route according to the Origin attribute in the following order: IGP > EGP > Incomplete.

D : This attribute is a well-known mandatory attribute.

Answer: A,C,D

Question 2

VRF, also called VPN instance, is a network virtualization technology that helps VPN technology to isolate users. In normal cases, multiple VPN instances can be created on a physical device, and each VPN instance has independent entries. Which of the following resources can be independently owned by a VPN instance?

Options :

A : Interface

B : Routing table

C : MAC address table

D : Routing protocol process

Answer: A,B,D

Question 3

Which of the following statements regarding multicast MAC addresses are false?

Options :

A : One multicast MAC address maps to 32 multicast IP addresses.

B : One multicast MAC address maps to only one multicast IP address.

C :

The high 24 bits of the multicast MAC address are 0x01005E, the 25th bit is fixed to 1, and the lower 23 bits of the MAC address map to the lower 23 bits of the multicast IP address.

D : A multicast MAC address identifies receivers of a multicast group on the data link layer.

Answer: B

Question 4

An enterprise administrator configures route summarization on ASBRs to reduce the number of inter-area Type 3 LSAs, which in turn reduces the routing table size and improves device resource utilization.

Options :

A : TRUE

B : FALSE

Answer: A

Question 5

Which of the following statements is false?

Options :

A :

If the current DR fails, the current BDR automatically becomes a new DR, and a BDR will be elected again.

B : A device with a higher router priority has a higher election priority.

C :

When a router with the highest router priority joins an OSPF network, this router will become the new DR.

D :

If two devices have the same router priority, the device with a larger router ID has a higher election priority.

Answer: C

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