Computer Networks

SSL (Secure Sockets Layer) is a cryptographic protocol designed to provide secure communication over a computer network. It creates an encrypted link between a web server and a browser, ensuring that all data transmitted remains private. The term 'Socket' refers to the endpoint of a network connection.

ICMP (Internet Control Message Protocol) is used for error reporting and network diagnostics. It's the protocol behind tools like ping and traceroute, which help troubleshoot network connectivity issues. The 'Control Message' part reflects its role in managing network communication problems.

TCP stands for 'Transmission Control Protocol,' one of the core protocols of the Internet Protocol Suite. It provides reliable, ordered, and error-checked delivery of data between applications. Note that it uses 'Protocol' not 'Procedure,' and 'Transmission' not 'Transfer.'

FTP stands for File Transfer Protocol, a standard network protocol used to transfer files between a client and server on a computer network. It's built on a client-server model architecture and separate control and data connections.

Private IP ranges are 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. The address 169.254.0.200 falls in the APIPA (169.254.0.0/16) range, which is link-local and not considered a private IP address for internal network use.

The Network layer (Layer 3) uses packets as its data unit. Frames are Layer 2 (Data Link), segments are Layer 4 (Transport), and bits are Layer 1 (Physical).

DNS (Domain Name System) uses port 53 for both UDP and TCP communication. Port 23 is used by Telnet, port 80 by HTTP, and port 110 by POP3 email protocol.

EIGRP (Enhanced Interior Gateway Routing Protocol) is a hybrid routing protocol that combines features of both distance-vector (like IGRP and RIP) and link-state (like OSPF) protocols. It uses DUAL algorithm for loop prevention and fast convergence.

RIP version 1 is a classful routing protocol that does not support VLSM (Variable Length Subnet Masking) or CIDR. IGRP, OSPF, and EIGRP all support VLSM. RIP v2 added VLSM support.

LDAP (Lightweight Directory Access Protocol) uses port 389 for standard communication and port 636 for LDAPS (LDAP over SSL). Port 110 is for POP3, 443 is for HTTPS, and 689 is not a standard LDAP port.

The default TCP port for TIBCO Rendezvous Routing Daemon (rvrd) is 7500. This is the standard port used for Rendezvous network communications. Ports 7600, 7680, and 7504 are used for other TIBCO services or are non-standard configurations.

Present perfect 'Mohan has come' correctly uses 'has' for third-person singular subjects. 'Mohan have comes' wrongly pairs singular subject with plural auxiliary and adds unnecessary 's', 'Mohan is come' incorrectly uses present continuous, and 'Mohan was come' misuses past tense.

In networking, a port is a numerical identifier (0-65535) that allows specific server processes or applications to send and receive data through network connections. When a client connects to a server, it specifies both the IP address and the port number to identify which service or process it wants to communicate with (e.g., port 80 for HTTP, port 25 for SMTP). This enables multiple network services to run concurrently on the same server. Options A and B are incorrect because they refer to unrelated concepts, and Option D is wrong because C is the correct definition.

SMTP stands for Simple Mail Transfer Protocol, which is the standard communication protocol used for transmitting email messages across the Internet. SMTP servers handle the sending and relaying of outgoing email messages between mail servers. When you send an email, your email client uses SMTP to transfer the message to your mail server, which then relays it to the recipient's mail server. The other options are incorrect acronyms that do not represent the actual SMTP protocol.