Question 1

On an OSPF network, an algorithm is used to prevent loops within an area, but loops may occur between areas. Therefore, OSPF defines a loop prevention mechanism for inter-area routes. Which of the following statements are true about the loop prevention mechanism?

Options :

A : Inter-area routes cannot be directly transmitted between non-backbone areas.

B : All non-backbone areas must be directly connected to area 0.

C : Inter-area routes need to be forwarded through area 0.

D :

An ABR cannot inject Type 3 LSAs that describe routes to a network segment in an area back to thesame area.

Answer: A,B,C,D

Question 2

VRRP is implemented based on thepriority and preemption functionsof VRRP routers.Which of the following statements is false about the VRRP solution?

Options :

A :

When preemption is enabled, a backup device preempts the master role if it has a higher priority than the current master.

B :

When preemption is disabled, a backup device does not preempt the master role even if it has a higher priority than the current master, provided that the current master is working properly.

C :

The master periodically sends VRRP Advertisement packets in the VRRP group to advertise its configurations such as the priority.

D :

Even if the VRRP device is the IP address owner, it still needs to participate in the election and does not directly transition to the Master state when receiving a message indicating that the interface goes Up.

Answer: D

Question 3

TheAS_Pathattribute is an importantBGP attributeused for route selection. Which of the following statements aretrueabout this attribute?

Options :

A : When a route is advertised to an IBGP peer, the AS_Path remains unchanged.

B : This attribute can be used to prevent BGP routing loops.

C : This attribute is a well-known discretionary attribute that must be identified by all BGP routers.

D : BGP ignores AS_Confed_Sequence and AS_Confed_Set when calculating the AS_Path length.

Answer: A,B,D

Question 4

When a routing policy is used to filter routes, which of the following route prefixes will be denied by the IP prefix below?

Options :

A : 1.1.1.1/26

B : 1.1.1.2/16

C : 1.1.1.1/32

D : 1.1.1.1/24

Answer: B,D

Question 5

An edge port is a new port role added to RSTP to overcome the disadvantages of STP. Which of the following statements is false about this port role?

Options :

A : The port does not participate in RSTP calculation.

B : The port can directly enter the Forwarding state from the Discarding state.

C : After receiving a configuration BPDU, the port is still in the Forwarding state.

D : The Up and Down states of the port do not cause network topology changes.

Answer: C

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