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Cisco Network Topologies and LAN Design

Chapter Description

This chapter from CCDA Exam Certification Guide reviews the topologies used in network design and covers the technologies and design approaches used when designing a local-area network (LAN). The hierarchical, redundant, and secure topology models are covered. Technologies like Ethernet, Fast Ethernet, FDDI, and Token Ring are also covered in this chapter. This chapter also discusses the characteristics of repeaters, bridges, switches, and routers, as well as how to apply these devices in a LAN environment. Finally, this chapter covers the Cisco products used in local-area networks.

Foundation Summary

Foundation Summary is a section presented in a concise format to provide quick reference information relating to the objectives covered in this chapter.

Table 4-11 Ethernet CSMA/CD Based Media

Specification

Speed

Max Segment Size

Encoding

Media

10Base5

10 Mbps

500m

Manchester

0.4in 50ohm Coax (Thicknet)

10Base2

10 Mbps

185m

Manchester

0.2in 50ohm Coax (Thinnet)

10BaseT

10 Mbps

100m

Manchester

UTP

100BaseT

100 Mbps

100m

4B/5B

UTP

1000BaseT

1000 Mbps

100m

5-level

Cat 5 UTP

1000BaseLX

(long wave)

1000 Mbps

550m

8B/10B

Single/multimode fiber

1000BaseSX (short wave)

1000 Mbps

62.5 micrometers: 220m

50 micrometers: 500m

8B/10B

Multimode fiber

1000BaseCX

1000 Mbps

25m

8B/10B

Shielded balanced copper


Table 4-12 Token Access Based Media

Type

Speed

Ring types

Encoding

Media

Token Ring

4/16 Mbps

Unidirectional single ring

Differential Manchester

UTP, STP

FDDI

100 Mbps

Dual counter rotation rings

4B/5B with nonreturn to zero inverted (NRZI)

Fiber


Table 4-13 Network Devices

Device

OSI Layer

Protocol

Domains

Understands

Repeaters

Layer 1: Physical

Transparent

Amplify signal

Bits

Hubs

Layer 1: Physical

Transparent

Amplify signal

Bits

Bridges

Layer 2: Data link

Transparent

Collision domain

Frames

Switches

Layer 2: Data link

Transparent

Collision domain

Frames

Routers

Layer 3: Network

Aware

Broadcast domain

Packets

Layer 3 Switches

Layer 3: Network

Aware

Broadcast domain

Packets


Table 4-14 LAN Types

LAN Type

Characteristics

Large building LAN

Large number of users, data center, floor closet switches

Campus LAN

High-speed backbone switching

Small/remote LAN

Small number of users, small hubs/switches


Table 4-15 Cisco Devices

Device

Characteristics

FastHub 400 repeater

12/24 ports of 10/100 Fast Ethernet

1900/2820 switch

12/24 ports of 10BaseT, 100 Mbps uplinks

2948G switch

48 ports of 10/100 Ethernet, 2 Gigabit Ethernet uplinks

3000 series switches

24 ports of 10BaseT stackable switches with expansion slots

3500 switch

10/100 autosensing, 2 Gigabit GBIC ports

3900 switch

24 Token Ring ports

4000 switch

Up to 24 Gigabit switched ports, plus expansion slots for up to 96 10/100 ports of 36 Gigabit Ethernet ports

5002 switch

2 slot modular chassis, 1 Mpps

5000 switch

5 slot modular chassis, 1–3 Mpps

5505 switch

5 slot modular chassis, 25 Mpps

5509 switch

9 slot modular chassis, 25 Mpps

5500 switch

13 slot modular chassis, supports Layer 3 line cards, and ATM modules