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NEW QUESTION 35
DRAG DROP
Drag and drop the terms to match with their descriptions.
Select and Place:
Answer:
Explanation:
Explanation:
Following are the terms with their descriptions:
A Trojan horse is a malicious software program that contains hidden code and masquerades itself as a normal
program. When a Trojan horse program is run, its hidden code runs to destroy or scramble data on the hard
disk. An example of a Trojan horse is a program that masquerades as a computer logon to retrieve user
names and password information. The developer of a Trojan horse can use this information later to gain
unauthorized access to computers. Trojan horses are normally spread by e-mail attachments. Ping sweep is a
technique used to determine which of a range of IP addresses map to live hosts. It consists of ICMP ECHO
requests sent to multiple hosts. If a given address is live, it will return an ICMP ECHO reply. A ping is often
used to check that a network device is functioning. To disable ping sweeps on a network, administrators can
block ICMP ECHO requests from outside sources. However, ICMP TIMESTAMP and ICMP INFO can be used
in a similar manner. Spamware is software designed by or for spammers to send out automated spam e-mail.
Spamware is used to search for e-mail addresses to build lists of e-mail addresses to be used either for
spamming directly or to be sold to spammers. The spamware package also includes an e-mail harvesting tool.
A backdoor is any program that allows a hacker to connect to a computer without going through the normal
authentication process. The main advantage of this type of attack is that the network traffic moves from inside
a network to the hacker's computer. The traffic moving from inside a network to the outside world is typically
the least restrictive, as companies are more concerned about what comes into a network, rather than what
leaves it. It, therefore, becomes hard to detect backdoors.
NEW QUESTION 36
Which of the following is a 16-bit field that identifies the source port number of the application program in the host that is sending the segment?
- A. Header Length
- B. Sequence Number
- C. Source Port Address
- D. Acknowledgment Number
Answer: C
Explanation:
Source Port Address is a 16-bit field that identifies the source port number of the application program in the host that is sending the segment.
Answer option C is incorrect. This is a 32-bit field that identifies the byte number that the sender of the segment is expecting to receive from the receiver.
Answer option B is incorrect. This is a 4-bit field that defines the 4-byte words in the TCP header. The header length can be between 20 and 60 bytes. Therefore, the value of this field can be between 5 and 15.
Answer option A is incorrect. This is a 32-bit field that identifies the number assigned to the first byte of data contained in the segment.
NEW QUESTION 37
Which of the following is a standard protocol for interfacing external application software with an information server, commonly a Web server?
- A. DHCP
- B. TCP
- C. CGI
- D. IP
Answer: C
NEW QUESTION 38
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