Which of the following protocols can be both connection-oriented and connectionless?
A.
20 FTP B.
53 DNS C.
67 DHCP D.
80 HTTP.
B.
Which of the following protocols can be both connection-oriented and connectionless?
A.
20 FTP
B.
53 DNS
C.
67 DHCP
D.
80 HTTP.
B.
The correct answer is B. 53 DNS.
DNS (Domain Name System) is a protocol used to translate human-readable domain names (such as www.example.com) into IP addresses (such as 192.168.1.1) that are used by network devices to locate and communicate with one another. DNS can operate in both connection-oriented and connectionless modes, depending on the specific implementation.
In connection-oriented mode, DNS uses the Transmission Control Protocol (TCP) to establish a reliable, two-way communication channel between the client and server. This mode is used when the data being transmitted is critical and must arrive at its destination intact and in order.
In connectionless mode, DNS uses the User Datagram Protocol (UDP) to transmit data without establishing a dedicated connection between the client and server. This mode is faster than connection-oriented mode but is less reliable since there is no guarantee that the data will arrive at its destination or arrive in the correct order. DNS typically uses connectionless mode for non-critical queries, such as looking up the IP address of a website.
To summarize, DNS can operate in both connection-oriented and connectionless modes, making it a versatile protocol for resolving domain names and IP addresses on a network.