Need help with multiple choice 1. WikiLeaks has recently faced DDoS (Distributed DoS) attacks. These attacks: (a) make use of Trojan horses to infect a specific host (b) use botnets with thousands of compromised hosts. (c) install malware that corrupts and deletes sensitive files (d) allow the attacker to reveal identities of people submitting documents to different servers. 2. Consider an IITTP client that wants to retrieve a Web document at a given URL. Assuming that the Paddress of the ITTTP server is initially unknown, what transport and application layer protocols besides IITTP are needed? (a) UDP (b)TCP (c) DNS d) all of the above 3. Which of the following is incorrect about IPv6? (a) The size of IPv6 addresses is 128 bits. (b) The routers use datagram fragmentation with IPv6 (c) There is no checksum in the IPv6 header (d) All the above are correct. 4. Which of the following is correct about the flow control service in TCP? (a) The sender selects the maximum segment size (MSS). (b)The receiver increases its application data rate. (c) The sender does not overflow the receiver\'s buffer by transmitting too many segments. d) The receiver increases its buffer size. 5. DIICP: (a) allows an ISP to obtain a set of IP addresses from the ICANN (Internet Corporation for Assigned Names and Numbers). (b) allows a router to allocate port numbers in a NAT(Network dress Translation (c) a host to dynamically obtain an IP address when it joins the network (d) both (a) and (c). Solution 1. b. 2. a. 3. b. 4. c. 5. d. 6. a. 7. a. 8. c. 9. b. 10. .

1. Need help with multiple choice
1. WikiLeaks has recently faced DDoS (Distributed DoS) attacks. These attacks: (a) make use of
Trojan horses to infect a specific host (b) use botnets with thousands of compromised hosts. (c)
install malware that corrupts and deletes sensitive files (d) allow the attacker to reveal identities
of people submitting documents to different servers. 2. Consider an IITTP client that wants to
retrieve a Web document at a given URL. Assuming that the Paddress of the ITTTP server is
initially unknown, what transport and application layer protocols besides IITTP are needed? (a)
UDP (b)TCP (c) DNS d) all of the above 3. Which of the following is incorrect about IPv6? (a)
The size of IPv6 addresses is 128 bits. (b) The routers use datagram fragmentation with IPv6 (c)
There is no checksum in the IPv6 header (d) All the above are correct. 4. Which of the following
is correct about the flow control service in TCP? (a) The sender selects the maximum segment
size (MSS). (b)The receiver increases its application data rate. (c) The sender does not overflow
the receiver's buffer by transmitting too many segments. d) The receiver increases its buffer size.
5. DIICP: (a) allows an ISP to obtain a set of IP addresses from the ICANN (Internet Corporation
for Assigned Names and Numbers). (b) allows a router to allocate port numbers in a
NAT(Network dress Translation (c) a host to dynamically obtain an IP address when it joins the
network (d) both (a) and (c).
Solution
1. b.
2. a.
3. b.
4. c.
5. d.
6. a.
7. a.
8. c.

2. 9. b.
10.