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EC-COUNCIL EC-Council Certified Network Defender CND Sample Questions (Q41-Q46):

NEW QUESTION # 41
Which of the following are the distance-vector routing protocols? Each correct answer represents a complete solution. Choose all that apply.

• A. RIP
• B. IGRP
• C. IS-IS
• D. OSPF

Answer: A,B
NEW QUESTION # 42
Which of the following IP class addresses are not allotted to hosts?Each correct answer represents a complete solution. Choose all that apply.

• A. Class C
• B. Class B
• C. Class A
• D. Class E
• E. Class D

Answer: D,E Explanation:
Class addresses D and E are not allotted to hosts. Class D addresses are reserved for multicasting, and their address range can extend from 224 to 239. Class E addresses are reserved for experimental purposes. Their addresses range from 240 to 254. Answer option A is incorrect. Class A addresses are specified for large networks. It consists of up to 16,777,214 client devices (hosts), and their address range can extend from 1 to 126. Answer option B is incorrect. Class B addresses are specified for medium size networks. It consists of up to 65,534 client devices, and their address range can extend from 128 to 191. Answer option E is incorrect. Class C addresses are specified for small local area networks (LANs). It consists of up to 245 client devices, and their address range can extend from 192 to
223.
NEW QUESTION # 43
Which of the following OSI layers is sometimes called the syntax layer?

• A. Physical layer
• B. Data link layer
• C. Presentation layer
• D. Application layer

Answer: C
NEW QUESTION # 44
Which of the following 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)?

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

Answer: D Explanation:
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. Answer option C is incorrect. 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.
NEW QUESTION # 45
John works as a C programmer. He develops the following C program:
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
int buffer(char *str)
{
char buffer1[10];
strcpy(buffer1, str);
return 1;
}
int main(int argc, char *argv[]) {
buffer (argv[1]);
printf("Executed\n");
return 1;
}
His program is vulnerable to a __________ attack.

• A. SQL injection
• B. Buffer overflow
• C. Cross site scripting
• D. Denial-of-Service

Answer: B
NEW QUESTION # 46
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