CCNA、CCNP、CCIE模拟试题(一)

1.Which of the following types of packets will be allowed entry when a serial
UDP ports 21, 23 and 25? (Select three options.)

2.One of the trainees assigned to you want to know which services use TCP. W

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

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

4.How would you configure a router to avoid situations such as split horizon

A. Configure a separate sub-interface for each PVC with a unique DLCI and subnet
B. Configure each Frame Relay circuit as a point-to-point line to support multicast
C. Configure one sub-interface to disperse into multiple PVC connections to
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.
C. Legacy DDR can use ACLs to define interesting traffic.
E. The BRI interfaces on ISDN routers with dialer profiles configured cannot belong
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
B. The periodic routing update interval is slightly different in each router on
C. Each router creates a routing table that only includes its directly connected
D. Link-state protocols send routing updates only when there is a change in the

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