为了帮助广大考生系统全面的复习好《思科认证：CCNA认证学科》，我们考吧网整理了思科认证模拟试题，本次汇编的模拟试题希望对你的考试有所帮助，预祝你考试顺利。

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?

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. What can you tell him?

A. DHCP

B. SMTP

C. SNMP

D. FTP

E. HTTP

F. 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.With regard to ISDN， which of the following are true?

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.

5.How would you configure a router to avoid situations such as split horizon issues hampering routing 0updates 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.

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