Long Distance Digital Connection

blackstartNetworking and Communications

Oct 26, 2013 (3 years and 9 months ago)

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IST 220
Test3 Review


Chapters
covered:
12,
13, 15, 16, 17, 18, 20, 21


Concepts to know:



Long Distance Digital Connection

Central office

Phone switch

Analog long
-
distance circuits (using amplifiers)

Digital long
-
distance circuits (using repeaters)

Lease
d line
s

DSU/CSU

T1, T2, T3 circuits

OC1, OC2, OC3


WAN
technologies

WAN

WAN switches

WAN switches vs. LAN switches

Why
MAC address based
f
orwarding tables

are not good for a WAN

Hierarchical
addressing scheme

Why hierarchical addresses can make routing ta
bles much smaller?

Packet
forwarding

in WAN (step
-
by
-
step)

Routing, routing table
s

Shortest path routing

Routers


Protocols and layering


Use both MAC addresses and hierarchical addresses

Routing layer header, routing layer payload

NIC layer header, NIC la
yer payload

Nested headers

How a message is transmitted across a WAN

(step
-
by
-
step)

How NIC layer headers are used to do address filtering

How routing layer headers are used
to
do routing

Layering

OSI reference model: physical la
yer, data link layer, netwo
rk layer
,
transport

layer
, session layer,
presentation layer,
application layer

What does a WAN do in each layer?


Internetworking

Internetworks

Internal routers vs. external routers

ISP; backbone

Physical networks

The

Internet


IP addresses

Two parts of
an IP address:
prefix and suffix

Five Classes of
IP addresses

Network Addresses and
Broadcast Addresses

Maximum numbers
of computers or networks within each class

How to identify
the class of an IP address

IP
Addresses fo
r
routers


IP datagram forwarding

A
ssigning IP addresses
to
an
internetwork

How a

message is
transmitted across an internetwork where IP is used

IP layer
(i.e., routing layer)
headers
and payloads

Network
interface
layer
(i.e., NIC layer)
headers and payloads

IP
-
based Routing tables

IP mask

TCP/IP reference model: physical layer, network interface layer, IP layer, TCP layer, application
layer

IST 220 reference model
: physical layer, NIC layer, routing layer, application layer