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Total 108 questions
A gateway must be configured for communication between a host and other hosts.
- A. True
- B. False
Answer : A
Which of the following statements about routers is false?
- A. A router works at the network layer.
- B. A router cannot isolate broadcast domains.
- C. A router can function as a gateway.
- D. A router can forward IP packets.
Answer : B
As shown in the figure, which of the following ports will be in blocking state?
- A. G0/0/2 of SWC
- B. G0/0/3 of SWB
- C. G0/0/1 of SWC
- D. G0/0/3 of SWA
Answer : B
Which of the following bridge IDs cannot exist in configuration BPDUs sent by a switch?
- A. 4096 00-01 -02-03-04-CC
- B. 0 00-01-02-03-04-CC
- C. 2048 00-01-02-03-04-CC
- D. 8192 00-01-02-03-04-CC
Answer : D
On the network shown in the figure, router A adopts link aggregation in manual load balancing mode, and G0/0/1 and G0/0/2 are added to link aggregation group (LAG) 1.
Which of the following statements is false about Eth-Trunk 1 on router A?
- A. If only G0/0/2 on router B is disabled, Eth-Trunk 1 is Up.
- B. If both G0/0/1 and G0/0/2 on router B are disabled, Eth-Trunk 1 is Down.
- C. If only G0/0/1 on router B is disabled, Eth-Trunk 1 is Up.
- D. If both G0/0/1 and GO/O/2 on router B are disabled, Eth-Trunk 1 is Up.
Answer : D
The last option field (option) of an IPv4 packet is a length-variable and optional field. What is the maximum length of this field?
- A. 40B
- B. 10B
- C. 20B
- D. 60B
Answer : D
Which of the following are not layers in the TCP/IP model? (Choose all that apply.)
- A. Session layer
- B. Network layer
- C. Application layer
- D. Presentation layer
- E. Transport layer
Answer : AD
Compared with STP, which of the following port roles does RSTP add? (Choose all that apply.)
- A. Root port
- B. Designated port
- C. Alternate port
- D. Backup port
Answer : ABD
When two switches are connected through link aggregation, what are the requirements for the interfaces on the two switches? (Choose all that apply.)
- A. The physical interface rates of the interconnected switches are the same.
- B. The physical interface IDs of the interconnected switches are the same.
- C. The duplex modes of the physical interfaces on the interconnected switches are the same.
- D. The physical interface quantities of the interconnected switches are the same.
- E. The models of the optical modules used by the interconnected switches are the same.
Answer : ACD
Which of the following networks are LANs? (Choose all that apply.)
- A. Internet
- B. Home network
- C. Office network of a company
- D. Broadband MAN
Answer : BC
On the network shown in the figure, the ports connecting switch A and switch B to hosts belong to VLAN 10 and VLAN 20 respectively. The ports through which the two switches are interconnected are trunk ports, and the PVIDs of the ports are 10 and 20, respectively. Which of the following statements are true? (Choose all that apply.)
- A. Host A and host B belong to different VLANs and cannot ping each other.
- B. Host A and host B can ping each other.
- C. When the data frames sent by the hosts are forwarded between the switches, the frames are untagged.
- D. ARP requests from host A cannot be forwarded to host B.
Answer : AC
The network administrator has decided to configure link aggregation in the enterprise network. Which of the following represent advantages of link aggregation? (Choose all that apply.)
- A. Load balancing.
- B. Improved bandwidth.
- C. Improved security.
- D. Enhanced reliability.
Answer : ABD
What are the advantages of OSPF? (Choose all that apply.)
- A. OSPF can load balance traffic among equal-cost routes.
- B. OSPF supports Classless Inter-Domain Routing (CIDR).
- C. OSPF supports area partition.
- D. OSPF supports packet authentication.
Answer : ABC
Which of the following statements are true about the OSPF neighbor status? (Choose all that apply.)
- A. The master/slave relationship of OSPF is formed in the ExStart state.
- B. After LSDB synchronization is completed, the router state changes to Full.
- C. The sequence number of DD packets is determined in the Exchange state.
- D. In the Exchange state, routers send DD packets that briefly describe link state information to each other to describe the content of the local link state database (LSDB).
Answer : ABD
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