Which of the following can be used to maintain data related to the user during navigation, possibly
across multiple visits?

A.
Cookie

B.
Access control list

C.
Web caching

D.
CPU cache

Explanation:

Cookie can be used to maintain data related to the user during navigation, possibly across multiple
visits.
Cookie is a block of data, which a Web server stores on the client computer. If no expiration date is
set for the cookie, it expires when the
browser closes. If the expiration date is set for a future date, the cookie will be stored on the client’s
disk after the session ends. If the
expiration date is set for a past date, the cookie is deleted.
Answer B is incorrect. Access Control List (ACL) is the most commonly used object in Cisco IOS. It
filters packets or network traffic by
controlling whether routed packets are forwarded or blocked at the router’s interfaces. According to
the criteria specified within the access
lists, router determines whether the packets to be forwarded or dropped. Access control list criteria
could be the source or destination

address of the traffic or other information. The types of Cisco ACLs are Standard IP, Extended IP, IPX,
Appletalk, etc.
Answer C is incorrect. Web caching is a method for minimizing performance bottlenecks and
reducing network traffic by serving locally
cached Web content. Web caching helps in reducing bandwidth utilization during periods of high
network traffic. High network traffic is usually
caused when a large number of users use the network at the same time. With a caching solution in
place, users’ requests will be returned
from the cache without having to travel over a WAN link to the destination Web server.
Answer D is incorrect. A CPU cache is a smaller faster memory used by the central processing unit of
a computer to reduce the average
time to access memory. It stores copies of the data from the most frequently used main memory
locations. When the processor needs to read
from or write to a location in main memory, it first checks whether a copy of that data is in the
cache. If so, the processor immediately reads
from or writes to the cache, which is much faster than reading from or writing to main memory.