0 — Test 325

Correct Answer: D. D. DNS, HTTP and DHCP
Explanation: HTTP is used to browse all the websites on the World Wide Web, DHCP is used to allot IPs automatically to the users on the internet, and DNS is used to connect the users to the host servers on the internet based on the Domain Name.

Correct Answer: B. B. 128 bits
Explanation: An IPv6 address is 128 bits long. Therefore, 2128 i.e. 340 undecillion addresses are possible in IPv6. IPv4 has only 4 billion possible addresses and IPv6 would be a brilliant alternative in case IPv4 runs out of possible new addresses.

Correct Answer: A. A. Packet switching
Explanation: Packet switching is the method based on which the internet works. Packet switching features delivery of packets of data between devices over a shared network.

Correct Answer: C. C. Resource reservation protocol
Explanation: Resource reservation protocol is a transport layer protocol used on the internet. It operates over IPv4 and IPv6 and is designed to reserve resources required by the network layer protocols.

Correct Answer: A. A. DHCP
Explanation: DHCP stands for Domain Host Control Protocol. It is responsible to remotely assign IP address to the clients connected to the internet. The server that performs this fuction is called the DHCP server.

Correct Answer: D. D. Packet switching
Explanation: Packet switching is not really related to media access control as it just features delivery of packets of data between devices over a shared network. Internet is actually based on packet switching.

Correct Answer: B. B. Udp
Explanation: The protocol field enables the demultiplexing feature so that the IP protocol can be used to carry payloads of more than one protocol type. Its most used values are 17 and 6 for UDP and TCP respectively. ICMP and IGMP are network layer protocols.

Correct Answer: D. D. 40bytes
Explanation: IPv6 datagram has fixed header length of 40bytes. It results in faster processing of the datagram. Fixed length IPv6 header allows the routers to process the IPv6 datagram packets more efficiently.

Correct Answer: C. C. Tos field
Explanation: The traffic class field is used to specify the priority of the IP packet which is a similar functionality to the Type of Service field in the IPv4 header. It’s an 8-bit field and its values are not defined in the RFC 2460.

Correct Answer: A. A. Broadcast
Explanation: There is no concept of broadcast address in IPv6. Instead, there is an anycast address in IPv6 which allows sending messages to a group of devices but not all devices in a network. Anycast address is not standardized in IPv4.