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Wireless & Mobile Communications Multiple Choice Questions on “TCP/IP Protocol”.
1. What layer in the TCP/IP stack is equivalent to the Transport layer of the OSI model?
a) Application
b) Host to host
c) Internet
d) Network Access
Answer: b
Clarification: The four layers of the TCP/IP stack (also called the DoD model) are Application/Process, Host-to-Host, Internet, and Network Access. The Host-to-Host layer is equivalent to the Transport layer of the OSI model.
2. You want to implement a mechanism that automates the IP configuration, including IP address, subnet mask, default gateway, and DNS information. Which protocol will you use to accomplish this?
a) SMTP
b) SNMP
c) DHCP
d) ARP
Answer: c
Clarification: Dynamic Host Configuration Protocol (DHCP) is used to provide IP information to hosts on your network. DHCP can provide a lot of information, but the most common is the IP address, subnet mask, default gateway, and DNS information.
3. The DoD model (also called the TCP/IP stack) has four layers. Which layer of the DoD model is equivalent to the Network layer of the OSI model?
a) Application
b) Host to Host
c) Internet
d) Network Access
Answer: c
Clarification: The four layers of the DoD model are Application/Process, Host-to-Host, Internet, and Network Access. The Internet layer is equivalent to the Network layer of the OSI model.
4. Which of the following protocols uses both TCP and UDP?
a) FTP
b) SMTP
c) Telnet
d) DNS
Answer: d
Clarification: DNS and some other services work on both TCP and the UDP protocols. DNS uses TCP for zone exchanges between servers and UDP when a client is trying to resolve a hostname to an IP address.
5. Length of Port address in TCP/IP is _________
a) 4bit long
b) 16bit long
c) 32bit long
d) 8 bit long
Answer: b
Clarification: TCP and UDP port numbers are 16 bits in length. So, valid port numbers can theoretically take on values from 0 to 65,535. These values are divided into ranges for different purposes, with certain ports reserved for particular uses.
6. TCP/IP layer is equivalent to combined Session, Presentation and _________
a) Network layer
b) Application layer
c) Transport layer
d) Physical layer
Answer: b
Clarification: TCP/IP network model is a hierarchical protocol made up of interactive modules, each of which provides a specific functionality; however, the modules are not necessarily interdependent. It is equivalent to combined session, presentation and application layer.
7. How many levels of addressing is provided in TCP/IP protocol?
a) One
b) Two
c) Three
d) Four
Answer: d
Clarification: Four levels of addresses are used in the internet employing the TCP/IP protocols. They are physical (link) addresses, logical (IP) addresses, port addresses, and specific addresses.
8. Virtual terminal protocol is an example of _________
a) Network layer
b) Application layer
c) Transport layer
d) Physical layer
Answer: b
Clarification: In open systems, a virtual terminal (VT) is an application service. It allows host terminals on a multi-user network to interact with other hosts regardless of terminal type and characteristics.
9. TCP/IP is related to __________
a) ARPANET
b) OSI
c) DECNET
d) ALOHA
Answer: a
Clarification: In 1983, TCP/IP protocols replaced NCP (Network Control Program) as the ARPANET’s principal protocol. And ARPANET then became one component of the early Internet. The starting point for host-to-host communication on the ARPANET in 1969 was the 1822 protocol, which defined the transmission of messages to an IMP.
10. A device operating at network layer is called __________
a) Router
b) Equalizer
c) Bridge
d) Repeater
Answer: a
Clarification: A router is a networking device that forwards data packets between computer networks. Routers perform the traffic directing functions on the Internet. It supports different network layer transmission standards. Each network interface is used to enable data packets to be forwarded from one transmission system to another.
11. A device operating at physical layer is called __________
a) Router
b) Equalizer
c) Bridge
d) Repeater
Answer: d
Clarification: A repeater connects two segments of your network cable. It retimes and regenerates the signals to proper amplitudes and sends them to the other segments. Repeaters work only at the physical layer of the OSI network model.