Selecting Internetworking Devices for a Campus Network Design

At this point in the network design process, you have developed a network topology and should have an idea of which segments will be shared with hubs or repeaters, bridged with bridges or switches, or routed using routers. Table 10-6 provides a review of the major differences between hubs (repeaters), bridges, switches, and routers.

Table 10-6. Comparing Hubs, Bridges, Switches, and Routers

OSI Layers Implemented

Bandwidth

Domains

Domains

Segmented

Additional

Features

Hub

1

All ports are in the same bandwidth domain.

All ports are in the same broadcast domain.

Connects individual devices in small LANs

Autopartitioning to isolate misbehaving nodes

Bridge

1-2

Each port delineates a bandwidth domain.

All ports are in the same broadcast domain.

Connects networks

User-configured packet filtering

Switch

1-2

Each port delineates a bandwidth domain.

All ports are in the same broadcast domain.

Connects individual devices or networks

Filtering, ATM

capabilities, cut-through processing, multimedia

(multicast)

features

Router

1-3

Each port delineates a bandwidth domain.

Each port delineates a broadcast domain.

Connects networks

Filtering, firewalling, high-speed

WAN links, compression, advanced queuing and forwarding processes, multimedia

(multicast)

features

After you have designed a network topology and made some decisions regarding the placement and scope of shared, switched, and routed network segments, you should then recommend actual hubs, switches, bridges, and routers from various vendors. This section covers selection criteria you can use when making decisions.

Criteria for selecting internetworking devices in general include the following:

• Processing speed

• The amount of memory

• The amount of latency introduced when the device relays data

• Throughput in packets per second (or cells per second for ATM)

• LAN and WAN technologies supported

• Autosensing of speed (for example, 10 or 100 Mbps)

• Autodetection of half- versus full-duplex operation

• Media (cabling) supported

• Ease of configuration

• Manageability (for example, support for Simple Network Management Protocol [SNMP] and remote monitoring [RMON], status indicators)

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Responses

  • kirsti
    What are the most important criteria for selecting an internetworking device?
    8 months ago

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