Q254. Which of the following IEEE 802.11 standards support operation in the 5GHz frequency band? (Multiple choice)

Q255. In the network shown in the figure below, all routers run the OSPF protocol, and the link cost value is shown in the figure. What is the cost value of the route entry to the network 10.0.0.0/8 in the RTA routing table?

Q256. Which of the following are not the characteristics of a small-sized campus network?

Q257. UDP cannot guarantee the reliability of data transmission, and does not provide the functions of message sequencing and flow control. It is suitable for flows with low transmission reliability requirements but high transmission speed and delay requirements.

Q258. After the network administrator uses the TracertRoute function on the router device, in the data packet sent by the router, what is the value of the Protoco1 field in the IPv4 header?

Q259. As shown in the figure below, the network and switch configuration information are shown in the figure. Which of the following statements is correct? (Multiple choice)

Q260. In which working state of the STP protocol can the port be changed to the Forwarding state without going through other states?

Q261. In the network shown in the figure below, the output information of switch A is shown in the figure. Then in the MAC address table of switch A, which interface does the MAC address of host B correspond to?

Q262. In the network shown in the figure below, all routers run OSPF protocol, which device is ABR? (Multiple choice)

Q263. In the network shown in the figure below, assuming that all routers enable the OSPF protocol at the same time, which router is the BDR in this network?

Q264. In order to distinguish different users and provide different network services on the AP. Which of the following can be configured?

Q265. The network devices running the SNMP protocol are running locally-an agent process.

Q266. On the VRP platform, the default protocol priority of routes in the direct routing, static routing, RIP, OSPF area is:

Q267. By default, network devices running SNMPv2c protocol use which of the following port numbers to send trap messages to the network management system?

Q268. The following two configuration commands can realize the router RTA to the same destination 10.1.1.0 routing master and backup backup.
【 RTA 】 ip route-static 10.1.1.0 24 12.1.1.1 permanent
【 RTA 】 ip route-static 10.2.2.0 24 13.1.1.1.

Q269. The Router ID of the OSPF process takes effect immediately after modification.

Q270. There are hosts in a private network that need to access the Internet. In order to achieve this requirement, which of the following configurations should the administrator do on the edge router of the network? (Multiple Choice)

Q271. By default, it takes at least 30s for the port status in the STP protocol to change from Disabled to Forwarding.

Q272. Using a traditional landline to make calls is a way of network communication.

Q273. The MAC address table of existing switches is shown in the figure. Which of the following statement is correct?

Q274. In the history of WLAN development, which of the following is not included in the main wireless protocol standards in the primary mobile office era?