1,Which of the following are valid types of ATM addresses?
answer:DCC(data country code),ICD(international code designator),NSAP(network layer service
access point)
2,Which of the following is true concerning the valid action to take for choosing Cisco products for use?
answer:Use Cisco Product Selection tool to plan for the hardware requirement
3,You are a Cisco Certified Engineer. You are configuring a remote access solution. Which of the following situations are NOT well served by an access server?
answer:Corporate staff requiring dial-out access
Mobile sales force requiring dial-in access
4,You are a Cisco Certified Engineer. You are configuring a DDR remote access solution. What command do you use to define interesting packets?
answer:dialer-list
5,You are a Cisco Certified Engineer. You are configuring a remote access solution. To ensure that the calls configured for callback can really connect, what command should you use?
answer:dialer callback-secure
6,Layer 2 of the ISDN signaling protocol is Link Access Procedure, D channel(LAPD). LAPD is similar to High-Level Data Link Control(HDLC) and Link Access Procedure, Balanced(LAPB).As the expansion of the LAPD acronym indicates, this layer is used across the D channel to ensure that control and signaling information flows and is received properly. The LAPD frame format is very similar to that of HDLC; like HDLC, LAPD uses supervisory, information, and unnumbered frames.
The LAPD protocol is formally specified in ITU-T Q.920 and ITU-T Q.921
7,When CHAP is enabled on an interface and a remote device attempts to connect to it, the access server sends a CHAP packet to the remote device. The CHAP packet requests or "challenges" the remote device to respond. The challenge packet consists of an ID, a random number, and the host name of the local router
8,Switched virtual circuits(SVCs) are temporary connections used in situations requiring only sporadic data transfer between DTE devices across the Frame Relay network. A communication session across an SVC consists of the following four operational states:
Call setup-The virtual circuit between two frame relay DTE devices is established
Data transfer-data is transmitted between the DTE devices over the virtual circuit
Idle-The connection between DTE devices is still active, but no data is transfered. If an SVC remains in an idle state for a defined period of time, the call can be terminated
Call termination-The virtual circuit between DTE devices is terminated
9,The Discard Eligibility(DE) bit is used to indicate that a frame has lower importance than other frames. The DE bit is part of the Address field in the frame relay frame header. DTE devices can set the value of the DE bit of a frame to 1 to indicate that the frame has lower importance than other frames. When the network becomes congested, DCE devices will discard frames with the DE bit set before discarding those that do not. This reduces the likelihood of critical data being dropped by Frame Relay DCE devices during periods of congestion
10,Dialer pool
Each interface references a dialer pool, which is a group of physical interfaces associated with a dialer profile. A physical interface can belong to multiple dialer pools. Contention for a specific physical interface is resolved by configuring the optional priority command
阅读(1996) | 评论(0) | 转发(0) |
