單項(xiàng)選擇題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.


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2.單項(xiàng)選擇題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.

3.單項(xiàng)選擇題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.

4.單項(xiàng)選擇題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……

5.單項(xiàng)選擇題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

6.單項(xiàng)選擇題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

7.單項(xiàng)選擇題What is the function of the command switchport trunk native vlan 999 on a switch?（）

A. It designates VLAN 999 for untagged traffic.
B. It blocks VLAN 999 traffic from passing on the trunk.
C. It creates a VLAN 999 interface.
D. It designates VLAN 999 as the default for all unkown tagged traffic.

9.單項(xiàng)選擇題Which command can you use to manually assign a static IPV6 address to a router interface?（）

A. ipv6 address PREFIX_1::1/64
B. ipv6 autoconfig 2001:db8:2222:7272::72/64
C. ipv6 autoconfig
D. ipv6 address 2001:db8:2222:7272::72/64

10.單項(xiàng)選擇題Why will a switch never learn a broadcast address?（）

A. Broadcast frames are never sent to swiches.
B. Broadcast addresses use an incorrect format for the switching table.
C. A broadcast address will never be the source address of a frame.
D. Broadcasts only use network layer addressing.
E. A broadcast frame is never forwarded by a switch.