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CCNA、CCNP、CCIE模拟试题

时间:2014-10-20 23:27来源:电脑教程学习网 www.etwiki.cn 编辑:admin

1.Which of the following types of packets will be allowed entry when a serial
interface’s inbound access list has been configured to prohibit entry for TCP and
UDP ports 21, 23 and 25? (Select three options.)
A. SMTP B. STP C. FTP D. Telnet E. HTTP F. POP3
2.One of the trainees assigned to you want to know which services use TCP. W
hat can you tell him? (Select three options.)

A. DHCP B. SMTP C. SNMP D. FTP E. HTTPF. TFTP

3.Which of the following network masks would you use to reduce any wastage of
IP addresses in point-to- point WAN links on a network that supports VLSM?

A. /38 B. /30 C. /27 D. /23 E. /18

4.How would you configure a router to avoid situations such as split horizon
issues hampering routing updates on a Frame Relay network?

A. Configure a separate sub-interface for each PVC with a unique DLCI and subnet
assigned to the subinterface.
B. Configure each Frame Relay circuit as a point-to-point line to support multicast
and broadcast traffic.
C. Configure one sub-interface to disperse into multiple PVC connections to
multiple remote router interfaces.
D. Configure as many as possible sub-interfaces on the same subnet.

5.With regard to ISDN, which of the following are true? (Choose all that apply.)

A. Legacy DDR can use port information to define interesting traffic.
B. Legacy DDR can configure multiple dialer configurations on the same interface.
C. Legacy DDR can use ACLs to define interesting traffic.
D. HDLC or PPP can be used to encapsulate ISDN D channel information.
E. The BRI interfaces on ISDN routers with dialer profiles configured cannot belong
to multiple dialer pools.
F. Dialer profiles cannot use ACLs to define interesting traffic.

- BSCI

6.Which of the following is a characteristic of link-state protocols?

A. A network topology change generates an update that is broadcast to every
router on the network.
B. The periodic routing update interval is slightly different in each router on
a subnet.
C. Each router creates a routing table that only includes its directly connected
neighbors.
D. Link-state protocols send routing updates only when there is a change in the
network topology.

7.What is the term associated with synchronizing the routing tables after a
 

11.Which command enables an EtherChannel bundle on a Catalyst 2900XL switch?

A. Port group
B. Set port channel on
C. Port etherchannel enable
D. Set etherchannel port enable

12.Which two statements about dynamic VLANs are true? (Choose two)

A. Each switch port is assigned to a specific VLAN.
B. Dynamic VLANs require a VLAN Membership Policy Server.
C. Devices are in the same VLAN regardless of which port they attach to.
D. Dynamic VLAN assignment are made through the command interface.

13.Which statement is correct about 802.1Q trunking? (Select all that apply)

A. Both switches must be in the same VTP domain.
B. The encapsulation type of both ends of the trunk does not have to match.
C. The native VLAN on both ends of the trunk must be VLAN 1.
D. 802.1Q trunking can only be configured on a Layer 2 port.
E. In 802.1Q trunking, all VLAN packets are tagged on the trunk link, except the
native VLAN.

14.You need to take advantage of FastEthernet ports. Which two actions avoid
configuration problems that cause the port to be automatically disabled? (Choose two)

A. Allow some ports in a channel to be disabled.
B. Configure the ports in a channel as dynamic VLAN ports.
C. Configure all ports in a channel to operate at the same speed and duplex mode.
D. Assign all ports in a channel to the same VLAN or configure them as trunk ports.

15.What is the cause of jitter?

A. Variable queue delays B. Packet drops
C. Transmitting too many small packets D. Compression

- BCRAN

16.Regarding DHCP, DHCP relay and DHCP server are mutually exclusive.

A. None of the choices.
B. True
C. False only for certain IOS version
D. False
E. False only for IOS version below V10

17.A LAPD Address field can be 1 or 2 bytes long.

A. True B. False C. True only in the US
D. True only in Asia E. True only in Europe

18.Which of the following are valid functions of the lock DTE modem attribute
(Choose all that apply)?

A. Disable UART.
B. Enable UART.
C. Locks the data speed between the computer motherboard and the RS232 port.
D. Locks the data speed between the modem and the DTE device.

19.Which of the following are not the valid types of ATM addresses (Choose
 

ABC has a switched network.
You want to control the designation of the spanning-tree root bridge in the ABC network. What should you do?

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