Question 1➡ |NTA UGC NET June 2019 What is the name of the protocol that allows a client to send a broadcast message with its MAC address and receive an IP address in reply?
i ➥ ARP
ii ➥ DNS
iii ➥ RARP
iv ➥ ICMP
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Answer: III Explanation: ARP : • Address Resolution Protocol [ARP] is a network layer protocol that is used to convert IP address into MAC address. • ARP is protocol that allows a client to send a broadcast message with its IP address and receive an MAC address in reply.
DNS: • DNS stands for Domain Name System. • DNS is a service that translates the domain name into IP addresses. • For example, the domain name www.samagraCS.com has a IP address 162.0.215.21(Suppose) • Where, www is a particular host server. • The com part of the domain name reflects the purpose of the organization or entity (in this example, commercial) and is called the top-level domain name. • The samagraCS part of the domain name defines the organization and together with the top-level is called the second-level domain name.
RARP: • Reverse Address Resolution Protocol (RARP) is a network layer protocol used to convert an IP address from a given physical address. • RARP is the complement of ARP. • “RARP is a protocol that allows a client to send a broadcast message with its MAC address and receive an IP address in reply”.
ICMP: • The ICMP stands for Internet Control Message Protocol. • ICMP is a network level protocol. • ICMP (Internet Control Message Protocol) is an error-reporting protocol that network devices such as routers use to generate error messages to the source IP address when network problems prevent delivery of IP packets.
Question 2➡ |NTA UGC NET November 2020 Post office protocol (POP) is a message access protocol which is used to extract messages for clients. In this regard, which of the following are true? A) POP has two modes, Delete mode and keep B) In Delete mode, mail is deleted from mailbox after each retrieval C) In Delete mode, mail is deleted from the mailbox before each retrieval. D) In keep mode, mail is deleted before retrieval. E) In keep mode, mail remains in the mailbox after retrieval.
Choose the correct answer from the options given below:
i ➥(A) and (B) only
ii ➥ (A), (D) and (E) only
iii ➥(A), (B), (C) and (D) only
iv ➥(A), (B) and (E) only
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Answer: IV Explanation:
POP has two modes: i)Delete Mode – A mail is deleted from the mailbox on the mail server after successful retrieval. (Delete after reading) ii)Keep Mode – A mail remains in the mailbox on the mail server after successful retrieval. (Store even after reading)
