TCP/IP problems
- 1. If you use either Telnet or FTP, which is the highest layer you are using to transmit data?
Options- A. Application
- B. Presentation
- C. Session
- D. Transport Discuss
Correct Answer: Application
Explanation:
Both FTP and Telnet use TCP at the Transport layer; however, they both are Application layer protocols, so the Application layer is the best answer.
- 2. 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.
Options- A. 1 only
- B. 2 and 3
- C. 1 and 4
- D. All of the above Discuss
Correct Answer: 2 and 3
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.
- 3. Which of the following allows a router to respond to an ARP request that is intended for a remote host?
Options- A. Gateway DP
- B. Reverse ARP (RARP)
- C. Proxy ARP
- D. Inverse ARP (IARP) Discuss
Correct Answer: Proxy ARP
Explanation:
Proxy ARP can help machines on a subnet reach remote subnets without configuring routing or a default gateway.
- 4. Which of the following is the decimal and hexadecimal equivalents of the binary number 10011101?
Options- A. 155, 0x9B
- B. 157, 0x9D
- C. 159, 0x9F
- D. 185, 0xB9 Discuss
Correct Answer: 157, 0x9D
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.
- 5. Which of the following protocols uses both TCP and UDP?
Options- A. FTP
- B. SMTP
- C. Telnet
- D. DNS Discuss
Correct Answer: DNS
Explanation:
DNS uses TCP for zone exchanges between servers and UDP when a client is trying to resolve a hostname to an IP address.
- 6. Which of the following describe the DHCP Discover message?
- It uses FF:FF:FF:FF:FF:FF as a layer 2 broadcast.
- It uses UDP as the Transport layer protocol.
- It uses TCP as the Transport layer protocol.
- It does not use a layer 2 destination address.
Options- A. 1 only
- B. 1 and 2
- C. 3 and 4
- D. 4 only Discuss
Correct Answer: 1 and 2
Explanation:
A client that sends out a DHCP Discover message in order to receive an IP address sends out a broadcast at both layer 2 and layer 3. The layer 2 broadcast is all Fs in hex, or
FF:FF:FF:FF:FF:FF. The layer 3 broadcast is
255.255.255.255, which means all networks and all hosts. DHCP is connectionless, which means it uses User Datagram Protocol (UDP) at the Transport layer, also called the Host-to-Host layer.
- 7. Which class of IP address provides a maximum of only 254 host addresses per network ID?
Options- A. Class A
- B. Class B
- C. Class C
- D. Class D Discuss
Correct Answer: Class C
Explanation:
A Class C network address has only 8 bits for defining hosts: 2
8 - 2 = 254.
- 8. What protocol is used to find the hardware address of a local device?
Options- A. RARP
- B. ARP
- C. IP
- D. ICMP Discuss
Correct Answer: ARP
Explanation:
Address Resolution Protocol (ARP) is used to find the hardware address from a known IP address.
- 9. What is the address range of a Class B network address in binary?
Options- A. 01xxxxxx
- B. 0xxxxxxx
- C. 10xxxxxx
- D. 110xxxxx Discuss
Correct Answer: 10xxxxxx
Explanation:
The range of a Class B network address is
128-191. This makes our binary range
10xxxxxx.
Programming
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