Domain 1.0: Networking Concepts
Jon Buhagiar · 2018
This chapter presents Comptia Network+ Objectives, explaining the purposes and uses of ports and protocols as well as devices, applications, protocols and services at their appropriate OSI layers. Secure Shell (SSH) is a cryptographic protocol that is used to remotely administer Linux server and network equipment through a text console. The SSH protocol uses public key cryptology to authenticate and encrypt network access from the remote computer. Simple Mail Transport Protocol (SMTP) is a protocol used by mail transfer agents (MTAs) to deliver emails to a destination email server. The protocol is used only in the process of delivering the email to the email server. Internet Control Message Protocol (ICMP) is a support protocol for TCP/IP that operates alongside of the IP protocol on the network layer. It is used by networking devices such as routers to identify operation problems, such as a gateway that is no longer responsive. The User Datagram Protocol (UDP) is a transport protocol for TCP/IP. UDP is one of two protocols at the transport layer that connect network applications to the network.