单项选择题If an Ethernet port on a router was assigned an IP address of 172.1.1.1/20,what is the maximum number of hosts allowed on this subnet?()

A. 4094
B. 1024
C. 8190
D. 2046
E. 4096


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1.单项选择题Which IPV6 routing protocol uses multicast group FF02::9 to send updates?()

A. RIPng
B. OSPFv3
C. static
D. IS-IS for IPv6

3.单项选择题Which type of EIGRP route entry describes a feasible successor?()

A. a primary route,stored in the routing table
B. a backup route,stored in the routing table
C. a backup route,stored in the topology table
D. a primary route,stored in the topology table

4.单项选择题How dose a DHCP server dynamically assign IP address to host?()

A. Addresses are allocated after a negotiation between the server and the host to determine the length of the agreement.
B. Addresses are assigned for a fixed period of time.At the end of period,a newquest for an address must be made ,and another address is then assigned.
C. Addresses are leased to host.A host will usually keep the same address by periodically contacting the DHCP sever to renew the lease.
D. Addresses are permanently assigned so that the host uses the same address at all times.

6.单项选择题What is the effect of using the service password-encryption command?()

A. Only passwords configured after the command has been entered will be encrypted.
B. Only the enable password will be encrypted.
C. Only the enable secret password will be encrypted
D. It will encrypt the secret password and remove the enable secret password from the configuration.
E. It will encrypt all current and future passwords.

7.单项选择题A router has two FastEthernet interfaces and needs to connect to four vlans in the local network.How can you accomplish this task,using the fewest physical interfaces and without decreasing network performance?()

A. Add two more FastEthernet interfaces.
B. Add a second router to handle the vlan traffic.
C. Use a hub to connect the four vlans with a FastEthernet interface on router.
D. Implement a router-on-a-stick configuration.

8.单项选择题Which statement is true, as relates to classful or classless routing?()

A. RIPV1 and OSPF are classless routing protocols.
B. Classful routing protocols send the subnet mask in routing updates.
C. Automatic summarization at classful boundaries can cause problems on disc……
D. EIGRP and OSPF are classful routing protocols and summarize routes by def……

9.单项选择题In which solution is a router ACL used?()

A. protecting a server frome unauthorized acces
B. controlling path selection,based on the route metric
C. reducing router CPU utilization
D. filterring packets that are passing through a router

10.单项选择题Which command can be used from a PC to verfy the connectivity between host that connect through path?()

A. tracert address
B. ping address
C. arp address
D. traceroute address