Download Solaris 8 Training Guide (310-043): Network Administrator by Rafeeq Ur Rehman PDF

By Rafeeq Ur Rehman

This publication is helping qualified Solaris method directors go the community Administrator examination. This examination is speedily expanding in popularity.This e-book follows the profitable education consultant structure, which promises stronger ideas within the type of lab examples, self-assessment possibilities, precis tables, and a number of other potent studying instruments - together with ExamGear -- that improve the educational adventure.

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Extra info for Solaris 8 Training Guide (310-043): Network Administrator Certification (Exam Gear)

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For example, the most commonly used protocol is the TCP/IP protocol, which has five layers (as compared to the seven layers in the OSI model). 7 The seven layers of ISO-OSI network model. OSI Layers The OSI model has seven layers. The bottommost layer (Layer 1) is the Physical layer, which deals with the actual hardware and electrical signals. The topmost layer (Layer 7) is the Application layer, and most network user interaction occurs with this layer only. In fact, a network user does not “see” the processes going on at the lower layers.

Access lists allow certain hosts and networks to enter a network, blocking the rest of the world. In other cases, selected hosts or networks, perhaps those generating offending network traffic, are blocked. The packet-filtering capabilities of routers also make these good firewalls. Some routers have network address translation (NAT) capability. This is a useful feature that enables you to hide private networks behind a router acting as NAT server and/or firewall. 1 Network 2 Network 1 Network 3 Network Protocols A network protocol may be thought of as a common language that all the hosts on a network understand.

Sometimes it is also called a multiport repeater. A simple repeater has only two ports. The signal entering one port is regenerated to the other port and vice versa. In the case of a hub, the signal entering one port is regenerated to all other ports. Hubs are available in a number of configurations. Usually multiple hubs are connected to a backbone to create larger local area networks. Like a repeater, a hub works at the Physical layer of the OSI network model. Bridges A bridge is used to connect networks together.

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