640-802 CCNA Study Guide - Elktech.org

Cisco 640-802 Exam
QUESTION NO: 297
What is one reason that WPA encryption is preferred over WEP?
A. A WPA key is longer and requires more special characters than the WEP key.
B. The access point and the client are manually configured with different WPA key values.
C. WPA key values remain the same until the client configuration is changed.
D. The values of WPA keys can change dynamically while the system is used.
Answer: D
Explanation:
WEP is security mechanism that encrypts grouping information between Access Point and Client
in "RC4" mode. Password is easily cracked. The encryption key that WEP uses includes the 40
bits (104 bits) general key that both receiver and sender predefined, and the 24 bits encryption key
(IV key) that sender defined for each group. However, in order to tell communication object the IV
key, IV key is embedded in the grouping information directly and sent out without encryption. If
wiretapping, collecting some certain IV key grouping information and then analyze, even secret
general key will be worked out.
QUESTION NO: 298
A network administrator is troubleshooting an EIGRP problem on a router and needs to confirm
the IP addresses of the devices with which the router has established adjacency.
The retransmit interval and the queue counts for the adjacent routers also need to be checked.
What command will display the required information?
A. Router# show ip eigrp adjacency
B. Router# show ip eigrp topology
C. Router#show ip eigrp interfaces
D. Router# show ip eigrp neighbors
Answer: D
Explanation: Explanation
Below is an example of the show ip eigrp neighbors command. The retransmit interval (Smooth
Round Trip Timer – SRTT) and the queue counts (Q count, which shows the number of queued
EIGRP packets) for the adjacent routers are listed:
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