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Question 101

Which of the following is the standard protocol that provides VPN security at the highest level?

A.P.M
B.IPSec
C.L2TP
D.None
E.PPP

Question 102

Which of the following is a service discovery protocol that allows computers and other devices to find services in a local area network without prior configuration?

A.NTP
B.SLP
C.NNTP
D.DCAP

Question 103

Which of the following policies is used to add additional information about the overall security posture and serves to protect employees and organizations from inefficiency or ambiguity?

A.User policy
B.Group policy
C.Issue-Specific Security Policy
D.IT policy

Question 104

Which of the following is a distributed application architecture that partitions tasks or workloads between
service providers and service requesters? Each correct answer represents a complete solution. Choose all that
apply.

A.Client-server computing
B.Peer-to-peer (P2P) computing
C.Client-server networking
D.Peer-to-peer networking

Question 105

Which of the following is a digital telephone/telecommunication network that carries voice, data, and video over an existing telephone network infrastructure?

A.PPP
B.Frame relay
C.ISDN
D.X.25

Correct Answer: C

Integrated Services Digital Network (ISDN) is a digital telephone/telecommunication network that carries voice, data, and video over an existing telephone network infrastructure. It requires an ISDN modem at both the ends of a transmission. ISDN is designed to provide a single interface for hooking up a telephone, fax machine, computer, etc. ISDN has two levels of service, i.e., Basic Rate Interface (BRI) and Primary Rate Interface (PRI). Answer option A is incorrect. The Point-to-Point Protocol, or PPP, is a data link protocol commonly used to establish a direct connection between two networking nodes. It can provide connection authentication, transmission encryption privacy, and compression. PPP is commonly used as a data link layer protocol for connection over synchronous and asynchronous circuits, where it has largely superseded the older, non-standard Serial Line Internet Protocol (SLIP) and telephone company mandated standards (such as Link Access Protocol, Balanced (LAPB) in the X.25 protocol suite). PPP was designed to work with numerous network layer protocols, including Internet Protocol (IP), Novell's Internetwork Packet Exchange (IPX), NBF, and AppleTalk. Answer option D is incorrect. The X.25 protocol, adopted as a standard by the Consultative Committee for International Telegraph and Telephone (CCITT), is a commonly-used network protocol. The X.25 protocol allows computers on different public networks (such as CompuServe, Tymnet, or a TCP/IP network) to communicate through an intermediary computer at the network layer level. X.25's protocols correspond closely to the data-link and physical-layer protocols defined in the Open Systems Interconnection (OSI) communication model. Answer option B is incorrect. Frame relay is a telecommunication service designed for cost-efficient data transmission for intermittent traffic between local area networks (LANs) and between end-points in a wide area network (WAN). Frame relay puts data in a variable-size unit called a frame. It checks for lesser errors as compared to other traditional forms of packet switching and hence speeds up data transmission. When an error is detected in a frame, it is simply dropped. The end points are responsible for detecting and retransmitting dropped frames.