Knowledge points of Network Management in 2014: Chapter 7]

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Chapter 7 LAN Interconnection

☆Lan interconnection is to connect multiple LAN networks for information exchange and resource sharing.

　　7.1 network interconnection requirements

7.1.1 LAN interconnection requirements

(1) There are three restrictions on LAN:

A. the LAN coverage distance is limited;

B. The number of computers connected to the LAN is limited;

> C. The traffic transmitted over the LAN is limited.

(2) When an organization needs to be configured with different types of LAN, the interconnection between different networks needs to be solved.

7.1.2 network interconnection type

(1) Five network interconnection types

A. Lan interconnection of the same type

B. Different types of LAN Interconnection

C. Connect the LAN through the backbone network

D. Connect the LAN through the WAN

E. LAN access to external computer systems

7.1.3 network interconnection Solution

　　7.2 Repeater

(1) is the simplest LAN extension device that runs on the physical layer. The function is to enlarge or regenerate the LAN signal.

　　7.3 Bridge

(1) The Bridge runs on the OSI data link layer.

7.3.1 bridging Ethernet

The bridging LAN uses a spanning tree)

7.3.2 Source Path Selection

(1) differences between the Source Path Algorithm and the Cross-supported Tree Algorithm

A. First, it can make full use of all router capabilities;

B. The Source Path Algorithm does not need to be processed in the bridge.

C. The disadvantage is that additional processing needs to be performed on the source station, and the route needs to be calculated repeatedly when the network configuration changes. 7.3.3 transparent Source Path

(1) The spanning tree bridge is also known as the transparent bridge.

7.3.4 conversion Bridge

(1) The conversion bridge is required for conversion between different LAN

7.3.5 FDDI Bridge

(1) Distributed Optical Fiber Interface data bridges connect many Ethernet networks and mark the ring networks. They are a common solution for campus networks.

(2) An encapsulation technology is required for the FDDI backbone network to interconnect Ethernet or mark the ring network.

7.3.6 bridge restrictions

(1) A bridge can only be used for a small number of connected network segments of the same type.

(2) The main limitation of Ethernet bridge is that it is difficult to provide more than two different routes between any two nodes in the network.

(3) The tag Ring Network selected with the source path can support more than two paths, but it is difficult to manage large networks.

(4) bridges are applicable to lan interconnection of the same type; conversion bridges are applicable to lan interconnection of different types; encapsulation bridges are applicable to FDDI

Backbone network interconnection.

　　7.4 vro

7.4.1 router Functions

(1) supports complex networks connected by multiple links and dynamically selects routes to balance the communication load of each route.

(2) differences between routers and bridges

A. It can filter and route based on the group type;

B. It supports networks with multiple links between LAN segments. When a link is damaged, you can select other routes;

C. The router can decide the route based on network communication conditions. When the network load is heavy, Each router can dynamically select the route.

7.4.2 Routing Algorithm

(1) PPP protocol: Only vrouters can operate on each other without any routing options. This applies to connecting two networks, and

Different routing protocols are used.

(2) the RIP Protocol allows the routing function, but always selects the same path based on the shortest route. In addition, its routing function is not strong,

It does not consider the current network communication status and communication costs.

(3) The OSPF protocol overcomes the above shortcomings and is suitable for large networks.

7.4.3 router configuration Scheme

　　7.5 Gateway

(1) The gateway not only has the routing function, but also can switch between two different protocol sets.

(2) The principle of gateway is similar to the language translation of different countries, and the Protocols of different protocol sets are translated and converted.

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