Networking Components

James Rouse

LTEC 4550.020 Network Administration

March 15, 2014 Assignment 3

HUB

Layer 1 OSI device All attached devices are one collision domain Advertised bandwidth shared between

attached devices Network design must follow 5-4-3 rule

– 5 segments– <= 4 hubs– <= 3 segments active

HUB

•Used in small offices with small budgets•Extends network/adds nodes•Price: sub $50

SWITCH

Layer 2 OSI device Isolates each port to single collision domain Support multiple physical connection types Advertised bandwidth dedicated per port Can be managed or unmanaged (providing

further segmenting of network, metrics, security, etc)

SWITCH

•Used in small, medium and enterprise networks•Network monitoring/reporting•Security•Price:

Unmanaged: $10-$300Smart: $150-500Managed: $200-thousands+

ROUTER

Layer 3 OSI device Connects opposing networks

Ex: private <> ISP Provides filtering of traffic by node or network

segment Can provide firewall, VPN, and traffic shaping

capabilities

ROUTER

•Used to separate networks•Provide additional security features•Price:

-SMB: $40-$1000-Enterprise: $1000-hundreds of thousands

BRIDGE

Layer 2 OSI Device Extends a segment beyond limits by

regenerating signal Joins two network segments of like or

differing standards/protocols Sometimes referred to as repeater

BRIDGE

•Often used in wireless networks•Price $30-300

GATEWAY

Edge of network before “cloud topology” External facing edge of DMZ Most often a router or software proxy Price: variable depending on complexity and

equipment used.

FIREWALL

Hardware or software based network communications filter

Can filter for a node or entire network Can be external facing edge or behind gateway in

DMZ Often incorporated in many physical routers

WIRELESS ACCESS POINT

Layer 2 OSI Device Bridge – between wireless segments or

physical <> wireless Allows wireless clients to access devices on

physical network Can be a router Can have or communicate with a network

access device to provide access filtering

WIRELESS ACCESS POINT

Used to connect wireless clients to physical network

Used to connect wireless networks together

Price: $30-several thousand