NEP Lecture 01

fullgorgedcutNetworking and Communications

Oct 24, 2013 (3 years and 11 months ago)

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© 2003, Cisco Systems, Inc. All rights reserv ed.

20/01/04

NEP

1

NEP Lecture 01

MM Clements

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20/01/04

NEP

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Router Function


Path determination


Packet switching


Application of security rules (ACLs)


Protocol conversion (encapsulation)


Link WANs and LANs


Interconnect communication lines

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20/01/04

NEP

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Introduction to WANs


A wide
-
area network (WAN) is a data
communications network spanning a large
geographic area such as a state, province, or
country.


Interconnects LANs & Hosts

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20/01/04

NEP

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WAN Devices


Switch connects PCs, servers to router


Modem terminates a data circuit


data circuit terminating
equipment (DCE)


Communication server allows many users access to a modem
link

© 2003, Cisco Sy stems, Inc. All rights reserv ed.

20/01/04

NEP

5

WAN Services

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20/01/04

NEP

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Data Link Encapsulations

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Routers Connected by WAN
Technologies

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20/01/04

NEP

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WAN Terminology


T1=1.544 Mbps, T3=44.736 Mbps , X.25,
SMDS (
SWITCHED MULTIMEGABIT DATA SERVICE
)
, ATM,
xDSL, Modem, Cable Modem, ISDN, OC
-
x


Work out what these are and MEMORISE
them


Test will be carried out next week

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20/01/04

NEP

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Network Layer Path Determination

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20/01/04

NEP

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Internetwork Routers


Any internetwork must
include the following:


Consistent end
-
to
-
end
addressing


Addresses that represent
network topologies


Best path selection


Dynamic routing


Switching


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20/01/04

NEP

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Router Internal Components

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20/01/04

NEP

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Internal Components of a 2600
Router

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20/01/04

NEP

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External Connections on a 2602
Router

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20/01/04

NEP

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Interplanetary Internet


Requirements


Problems


TCP/ IP?


Artificial Intelligence or Autonomy?


Error control


Data rates


Other considerations


© 2003, Cisco Sy stems, Inc. All rights reserv ed.

20/01/04

NEP

15

Conclusion


Routers choose paths and switch data packets


IOS runs on Cisco hardware


Perform protocol conversion


Apply security


No hard disk


all solid state


New routers have modular chassis for flexibility