Question 1

Link aggregation is a common network technology. Which of the following are advantages of link aggregation?

Options :

A : Load balancing

B : Improved reliability

C : Increased link bandwidth

D : Route backup

Answer: A,B,C

Question 2

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 3

IP multicast effectively conserves network bandwidth and reduces network load. Therefore, it is widely used in network services, such as IPTV, real-time data transmission, and multimedia conferencing.

Options :

A : TRUE

B : FALSE

Answer: A

Question 4

Which of the following statements regarding OSPF is true?

Options :

A :

OSPF does not have an acknowledgement mechanism. Therefore, OSPF relies on the upper-layer protocol, TCP, for acknowledgement.

B : OSPF performs LSDB update every 30 minutes.

C : OSPF uses the Bellman-Ford algorithm, and each router independently runs this algorithm.

D : OSPF floods a LSU packet at an interval of 5s.

Answer: B

Question 5

Which of the following statements is false about the default processing of the next hop address when a BGP device advertises a route?

Options :

A :

When advertising a locally originated route to an IBGP peer, a BGP device sets the next hop address to the IP address of its interface connected to the peer.

B :

When advertising a non-labeled route received from an EBGP peer to an IBGP peer, a BGP device changes the next hop address to the IP address of its interface connected to the IBGP peer.

C :

When advertising a route to an EBGP peer, a BGP device sets the next hop address to the IP address of its interface connected to the peer.

D :

A BGP device does not change the next hop address of a route if the route is received from an IBGP peer and is to be sent to another IBGP peer.

Answer: B