11.
Which of the following is the decimal and hexadecimal equivalents of the binary number 10011101?
A. 155, 0x9B
B. 157, 0x9D
C. 159, 0x9F
D. 185, 0xB9
Answer & Explanation
Answer: Option B
Explanation:
To turn a binary number into decimal, you just have to add the values of each bit that is a 1. The values of 10011101 are 128, 16, 8, 4, and 1. 128 + 16 + 8 + 4 + 1 = 157.
Hexadecimal is a base-16 number system. The values of hexadecimal are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F-16 characters total, from which to create all the numbers you’ll ever need. So, if 1001 in binary is 9, then the hexadecimal equivalent is 9. Since we then have 1101, which is 13 in binary, the hexadecimal answer is D and the complete hexadecimal answer is 0x9D.
View Answer Workspace Report Discuss in Forum
12.
Which statements are true regarding ICMP packets?
They acknowledge receipt of a TCP segment.
They guarantee datagram delivery.
They can provide hosts with information about network problems.
They are encapsulated within IP datagrams.
A. 1 only
B. 2 and 3
C. 3 and 4
D. 2, 3 and 4
Answer & Explanation
Answer: Option C
Explanation:
Internet Control Message Protocol (ICMP) is used to send error messages through the network, but they do not work alone. Every segment or ICMP payload must be encapsulated within an IP datagram (or packet).
View Answer Workspace Report Discuss in Forum
13.
Which of the following are layers in the TCP/IP model?
Application
Session
Transport
Internet
Data Link
Physical
A. 1 and 2
B. 1, 3 and 4
C. 2, 3 and 5
D. 3, 4 and 5
Answer & Explanation
Answer: Option B
Explanation:
This seems like a hard question at first because it doesn’t make sense. The listed answers are from the OSI model and the question asked about the TCP/IP protocol stack (DoD model). However, let’s just look for what is wrong. First, the Session layer is not in the TCP/IP model; neither are the Data Link and Physical layers. This leaves us with the Transport layer (Host-to-Host in the DoD model), Internet layer (Network layer in the OSI), and Application layer (Application/Process in the DoD).
View Answer Workspace Report Discuss in Forum
14.
Which layer 4 protocol is used for a Telnet connection?
A. IP B. TCP
C. TCP/IP D. UDP
Answer & Explanation
Answer: Option B
Explanation:
Although Telnet does use TCP and IP (TCP/IP), the question specifically asks about layer 4, and IP works at layer 3. Telnet uses TCP at layer 4.
View Answer Workspace Report Discuss in Forum
15.
Which statements are true regarding ICMP packets?
ICMP guarantees datagram delivery.
ICMP can provide hosts with information about network problems.
ICMP is encapsulated within IP datagrams.
ICMP is encapsulated within UDP datagrams.
A. 1 only
B. 2 and 3
C. 1 and 4
D. All of the above
Answer & Explanation
Answer: Option B
Explanation:
ICMP is used for diagnostics and destination unreachable messages. ICMP is encapsulated within IP datagrams, and because it is used for diagnostics, it will provide hosts with information about network problems.