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3DX5X VOL2 > Unit 1 STQ 201-204 > Flashcards

Unit 1 STQ 201-204 Flashcards

1
Q

Into what two categories can the OSI model be divided?

A
  1. Application layer (upper)

2. Data Transport layer (lower)

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2
Q

What are the responsibilities of the Data Transport layers of the OSI model?

A

Defines how data is sent across the physical media, through Internetwork devices, to the destination computer, and to the application on the destination machine

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3
Q

This layer’s specifications include physical addressing, sequencing of frames, and flow control

A

Data Link or Layer 2

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4
Q

This layer typically includes multiplexing, virtual circuit management, and error checking and recovery

A

Transport or Layer 4

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5
Q

This layer typically defines the electrical, mechanical, procedural, and functional specifications for network communications

A

Physical or Layer 1

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6
Q

A hub operates at this layer

A

Physical or Layer 1

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7
Q

TCP operates at this layer

A

Transport or Layer 4

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8
Q

Switches and bridges operate at this layer

A

Data Link or Layer 2

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9
Q

This layer provides routing and related functions that enable multiple data links to be combined into an Internetwork

A

Network or Layer 3

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10
Q

This layer provides a variety of coding and conversion functions that are applied to application layer data

A

Presentation or Layer 6

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11
Q

A router operates at this layer

A

Network or Layer 3

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12
Q

Telnet, FTP, and SMTP that exist in the TCP/IP suite operate at this layer

A

Application or Layer 7

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13
Q

This layer establishes, manages, and terminates communication sessions between presentation layer entities

A

Session or Layer 5

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14
Q

At this layer, common data compression and encryption schemes are used

A

Presentation or Layer 6

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15
Q

What is a physical topology?

A

It is the layout of the network media that interconnects the devices on a network

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16
Q

What is a logical topology?

A

It defines the way in which devices communicate and data is transmitted throughout the network

17
Q

What is the rule of thumb to distinguish physical from logical topologies?

A

If you can see it and touch it, it’s physical. If you cannot see it or touch it, it’s logical

18
Q

A topology affects the network’s capabilities; what is the impact of choosing one topology over another?

A
  1. Equipment type
  2. Equipment capabilities
  3. Network growth
  4. Network management method
19
Q

What are the advantages of a bus topology?

A
  1. Works well for small networks (2-10 devices)
  2. Inexpensive to install (esp. Thinnet)
  3. Requires less cable
  4. Easy to add wksts
20
Q

What are the disadvantages of a bus topology?

A
  1. No longer recommended for new installs
  2. Backbone breaks -> network is down
  3. Number of devices can include is limited
  4. Problem isolation is difficult
  5. Slower access time
21
Q

What are the advantages of a star topology?

A
  1. Easy to add devices
  2. Failure of one cable will not bring down entire network
  3. Hub provides centralized management
  4. Easy to find device and cable problems
  5. Can be upgraded to faster network speeds
  6. Most common topology–many equipment options
22
Q

What are the disadvantages of a star topology?

A
  1. Requires more media than a ring or bus network
  2. Failure of the central hub can bring down the entire network
  3. Installation & equipment costs are higher than most bus networks
23
Q

What are the advantages of a ring topology?

A
  1. Data packets can travel faster
  2. No collisions
  3. Easier to locate device & cable problems
  4. Terminators not needed
24
Q

What are the disadvantages of a ring topology?

A
  1. Requires more cable than a bus network
  2. Break in the cable will bring down many ring networks
  3. All devices suspended from the network when new devices are added
  4. Limited amount of equipment available
25
Q

Name the four layers of the TCP/IP suite

A
  1. Data Link
  2. Network
  3. Transport
  4. Application
26
Q

What standards are protocols at the Data Link layer based on?

A

Project 802 standards, adopted by the IEEE

27
Q

What are the four most important TCP/IP protocols that function w/in the network layer?

A
  1. IP
  2. ARP
  3. RARP
  4. ICMP
28
Q

What are the fields belonging to a TCP segment?

A
  1. Source port
  2. Destination port
  3. Sequence number
  4. Acknowledgement number
  5. TCP leader length
  6. Reserved
  7. Flags
  8. Sliding window size
  9. Checksum
  10. Urgent pointer
  11. Options
  12. Padding
  13. Data
29
Q

What are some reasons for implementing DHCP?

A
  1. Reduce time spent on IP address management
  2. Reduce the potential for errors in assigning IP addresses
  3. Makes IP addressing transparent for mobile users

3DX5X VOL2 (4 decks)

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