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COM 309 > Chapter 5 > Flashcards

Chapter 5 Flashcards

1
Q

4 Physical Layer Function

A
  1. filter out signal disturbance caused by EMI and RFI
  2. amplify and reshape incoming signal
  3. retime the signal (in ethernet applications)
  4. reproduce the signal on all cable runs
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2
Q

Collision Domain

A
  • segments where collisions occur

- caused by two or more nodes transmitting at once

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3
Q

Tasks Performed by MAU

A
  1. connect nodes in a logical ring through a physical star topology
  2. move the token and frames around the ring
  3. amplify data signals
  4. expand token ring network by daisy-chain connections
  5. provide for orderly movement of data
  6. shut down ports to malfunctioning nodes
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4
Q

3 Frame Scenarios

A
  • destination of frame is on same segment as source; bridge drops frame (since no forwarding is needed
  • destination of frame is on another segment known to bridge; bridge transmits frame to known segment only
  • destination of frame is not known to bridge; bridge transmits frame to all segments but the source
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5
Q

3 Primary Bridge Functions

A
  1. learning
  2. filtering
  3. forwarding
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6
Q

Learning Bridge Function

A
  • learn network topology and device addresses

- information is stored in a bridging table

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7
Q

Filtering Bridge Function

A
  • do not flood certain frames, discard others

- enables the bridge to be used for security purposes

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8
Q

Forwarding Bridge Function

A
  • transmit frames to destination

- based on data built-in to the bridging table

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9
Q

Advantages of Bridge over Repeaters & Hubs

A
  • ability to segment network traffic

- may serve as a firewall to keep intruders out

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10
Q

Hop

A
  • a regenerative, amplification, and movement of a packet from one network onto another by a router
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11
Q

Router

A
  • connects two or more similar networks together

- protocols including routing protocol which uses information from routing table

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12
Q

Static Routing

A
  • manually setting up and maintaining route

- always know path between routers

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13
Q

Dynamic Routing

A
  • path between routers are unknown until you begin to send out packets
  • routing tables are updated automatically
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14
Q

Routers Two Important Databases

A
  • routing tables

- network status

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15
Q

Routing Table

A
  • contains addresses of other routers
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16
Q

Network Status

A
  • contains information about traffic, topology, and status of links
17
Q

RIP

A
  • Routing Information Protocol
  • determines shortest number of hops to other routers
  • only uses hop count as a metric
18
Q

OSPF

A
  • Open Shortest Path First

- sends only a portion of table related to immediate links

19
Q

Advantages of OSPF over RIP

A
  • routing information is packaged in a more compact format

- there is no hop count limit as with RIP

20
Q

Cut Through

A
  • forward portions of frame before entire frame is received
21
Q

Store and Forward

A
  • frame is buffered until entire frame is received
22
Q

Gateway

A
  • enables two networked systems (software or hardware) to connect
  • convert common protocols to specialized type
23
Q

WAN Transmission Devices

A
  • telephone modems
  • ISDN adapters
  • Cable TV Modems
  • DSL modems/routers
  • Access Servers
  • Remote Routers
24
Q

Synchronous

A
  • continuous data bursts controlled by a clock signal
25
Q

Asynchronous

A
  • discrete signal delimited by start and stop bits
26
Q

ISDN Adapters

A
  • connect PCs to ISDN lines with a terminal adapter
27
Q

Terminal Adapter (TA)

A
  • modem-like device

- converts digital signal for transmission over digital telephone line

28
Q

Upstream

A
  • transmit outgoing data, sound, TV signals
29
Q

Downstream

A
  • receive and blend incoming signals
30
Q

Cable TV Modems

A
  • maximum bandwidth reduced by other subscribers
31
Q

DSL Modem and Routers

A
  • works over copper wire likes ISDN
  • dedicated DSL line is more secure
  • dedicated DSL line provides full bandwidth for the link
32
Q

Access Servers

A
  • combines WAN communications into one device

- small access servers may have 8 or 16 asynchronous ports

33
Q

Remote Routers

A
  • similar to a local routers

COM 309 (6 decks)

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