1. Name all the security services provided in a network communication.

There are several ways to provide security in the network communications. There are different network security technologies and techniques that help to maintain the security in your network such as IPSec, cryptography, SSL, Kerberos, Certificates, PKI, firewall, antivirus solutions and the physical security. Secure communication is necessary to maintain the integrity of the data.
A specialized field in computer networking that involves securing a computer network infrastructure[->0]. Network security is typically handled by a network administrator or system administrator[->1] who implements the security policy[->2], network software[->3] and hardware[->4] needed to protect a network and the resources accessed through the network from unauthorized access and also ensure that employees have adequate access to the network and resources to work.

A network security system typically relies on layers of protection and consists of multiple components including networking monitoring and security software in addition to hardware and appliances. All components work together to increase the overall security of the computer network.
Security involves the authorization, authentication and privacy and it can be achieved by implementing a security solution in your network.
A network is susceptible by various internal and external threats such as viruses, Trojans, spyware, adware, hackers and physical security threats. The insecure and unmanaged communication may results into the loss of data, identity theft and the loss of the private information. The following techniques should be implemented to make your communications secure.
Firewall
A firewall can be a software or hardware device. Implementing a firewall solution in your network enables the administrators to monitor the incoming and outgoing