Ch.11

Question 1

1. What is layer 4 of the OSI model?

A. Presentation
B. Network
C. Data Link
D. Transport

Answer 1

D. Transport

Question 2

2. What is encapsulation?

A. Changing the source and destination addresses of a packet
B. Adding a header and footer to data as it moves down the OSI stack
C. Verifying a person’s identity
D. Protecting evidence until it has been properly collected

Answer 2

Answer: B

Encapsulation is adding a header and footer to data as it moves down the OSI stack.

Question 3

3. Which OSI model layer manages communications in simplex, half-duplex, and full-duplex modes?

A. Application
B. Session
C. Transport
D. Physical

Answer 3

Answer: B

Layer 5, Session, manages simplex (one-direction), half-duplex (two-way, but only one direction can send data at a time), and full-duplex (two-way, in which data can be sent in both directions simultaneously) communications.

Question 4

Which of the following is not a technology specifically associated with 802.11 wireless networking?
A. WAP
B. WPA
C. WEP
D. 801.11i

Answer 4

A. WAP

Question 5

What function does RARP perform?
A. It is a routing protocol
B. It converts IP addresses into MAC addresses
C. It resolves physical addresses into logical addresses
D. It manages multiplex streaming.

Answer 5

C. It resolves physical addresses into logical addresses

Question 6

Which protocol responds to a PING request?
A. RARP
B. ICMP
C. ARP
D. TCP

Answer 6

B. ICMP

Question 7

Which type of firewall first examines a packet to see if it is the result of a previous connection?
A. Packet- filtering firewall
B. Application-level firewall
C. Stateful firewall
D. Circuit-Level firewall

Answer 7

C. Stateful Firewall

Question 8

Which protocols operate at the transport layer of the OSI model? 
A. HTTP
B. IP
C. IPX
D. TCP
E. UDP

Answer 8

D.TCP

E.UDP

Question 9

Which type of firewall only examines the packet header information?  
A. Kernel proxy firewall
B. stateful firewall
C. application-level proxy firewall
D. packet filtering firewall

Answer 9

D. Packet filtering firewall

Question 10

What is a disadvantage of a hardware firewall when comparing it to a software firewall?
A. It is easier to make configuration errors than in a software firewall
B. It has lower performance capability than a software firewall
C. It provides decreased security as compared to a software firewall
D. It has a fixed number of interfaces availability

Answer 10

D. It has a fixed number of interfaces available