Which of the following can be used to maintain data related to the user during navigation, possibly
across multiple visits?
A.
Web caching
B.
CPU cache
C.
Cookie
D.
Access control list
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 option D 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 destinationaddress of the traffic or other information. The types of Cisco ACLs are Standard IP, Extended IP, IPX,
Appletalk, etc. Answer option A 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 option B 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.
Reference: “http://en.wikipedia.org/wiki/Cookie”