1. Which best describes the benefit of using Frame Relay as opposed to a leased line or ISDN service?

Customers only pay for the local loop and the bandwidth they purchase from the network provider.

2. Which statement about Frame Relay subinterfaces is correct?

Point-to-point subinterfaces act like leased lines and eliminate split-horizon routing issues.

3. What best describes the use of a data-link connection identifier (DLCI)?

locally significant address used to identify a virtual circuit

4. What is created between two DTEs in a Frame Relay network?

virtual circuit

5. Which two items allow the router to map data link layer addresses to network layer addresses in a Frame Relay network? (Choose two.)

Inverse ARP
LMI status messages

6. Refer to the exhibit. What can be known about the configuration of router R1 from the output?

The command encapsulation frame-relay ietf has been used on the Serial 0/0/0 interface.

7. Refer to the ex ... Читать дальше »

1. Refer to the exhibit. What can be concluded about the function of the Serial 0/0/0 interface on the router after the commands are entered?

The serial link will be closed if the number of received packets at the destination node falls below 90 percent of the packets that are sent.

2. Refer to the exhibit. While troubleshooting a serial interface, a technician enters the command show interface serial 0/0/0 . If the interface is in DCE mode, what two problems are likely to cause the indicated problem? (Choose two.)

The remote CSU or DSU has failed.
A timing problem has occurred on the cable.

3. Refer to the exhibit. What statement is true regarding the output shown?

One router has suggested PAP authentication, and the other has accepted authentication but suggested CHAP
authentication.

4. Why are serial connections preferred over parallel connections for long transmission lengths?

Parallel connections are subject to clock skew and to crosstalk ... Читать дальше »

1. Which statement about WAN protocols is correct?

Most WAN protocols use HDLC or a variant of HDLC as a framing mechanism.

2. Which statement is true of the functionality of the layers in the hierarchical network model?

The distribution layer aggregates WAN connections at the edge of the campus.

3. Which WAN technology uses a fixed payload of 48 bytes and is transported across both switched and permanent virtual circuits?

ATM

4. A U.S. company requires a WAN connection used only to transfer sales data from individual stores to the home office. All transfers will occur after business hours. The required bandwidth for this connection is estimated to be less than 38 kbps. Which type of connection requires the least investment for this company?

analog dialup

5. What is an advantage of packet-switched technology over circuit-switched technology?

Packet-switched networks can efficiently use multiple routes inside a service provider network.

6. Which s ... Читать дальше »