Computer Networks — Test 16

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: 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.

Correct Answer: A. A. Tcp
Explanation: Since TCP is a reliable protocol, it’s more efficient to use TCP protocol for e-mail transfer. TCP also provides more security than other transport layer protocols.

Correct Answer: A. A. SMTPs
Explanation: SSMTP is a simple mail transfer program to send mail from a local PC to a mail host. SNMP is a network management protocol. STARTTLS connections are secured by TLS.

Correct Answer: D. D. 25
Explanation: Port 21 is used for FTP control connection, port 22 is used by SSH, and port 23 is used by TELNET.

Correct Answer: D. D. FTP
Explanation: FTP is used to share files. SMTP, POP and IMAP are the protocols used to send and receive mails on the internet.