GO Classes Test Series 2024 | Mock GATE | Test 14 | Question: 25

Question

A host uses a variety of protocols to discover information about the network it is connected to. Which of the following statements are TRUE?

• A. To perform a DNS lookup, a host must first discover the IP address of its local DNS server using DHCP.
• B. To transmit a packet outside the host’s subnet, the host must first discover the IP address of its first-hop router using DHCP.
• C. To send a packet to another host outside its subnet, a host must first discover the IP address of the destination host using DNS.
• D. To send a packet to another host in the same subnet, a host must first discover the MAC address of the destination host using ARP.

Comments

Sir why B and C are false we use DHCP for obtaining

1. Ip address of host

2. Network mask

3. Default gateway address

4. Address of DNS server

and we definitely require destination host address to send a packet outside of network and it will be done with the help of DNS.

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@GO Classes To send a packet to another host( outside the subnet ) host can get Destination IP from ICMP error packet too . In that case how option C is true as there its not mentioned its the first packet and "must" word is there too 

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https://www.youtube.com/live/CFoJsU6nvq4?si=wuunpk5yb0dc6gt_&t=2455

check solution

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According to the solution video answer should be A,C and D. B is Falseeeeeeeeee.

Answer 1

According to the solution video given by Go Classes here https://www.youtube.com/watch?v=CFoJsU6nvq4&t=2455s as shown by Krishna above, the answer should be A, B, C and D.