Sybex CH 11-12 JLB

Question 1

Which is the least expensive and easiest to use type of cable?

1. Coax Cable.
2. Fiber Optic Cable.
3. Twisted-Pair Cable.
4. Shielded Cable.

Answer 1

3. Twisted-Pair Cable.

Question 2

Which of the following is NOT a Network LAN Topology?

1. Bus.
2. Tree.
3. Branch.
4. Mesh

Answer 2

3. Branch.

________________________________________

The LAN Topologies include:

• Bus* - Linear, single cable. If one station has a problem all other on the same cable are impacted.
• Ring* - All computers are connected by a one-direction, closed loop. When one station has a problem all other on the same ring can be impacted.
• Star* - All computers are connected to a central device–which is the single point of failure.
• Tree* - A type of bus topology that does not have one linear cable but branches of cables.
• Mesh -* Servers are interconnected to each other to provide redundancy and high availability. There is no single point of failure.

There is no such thing as a Branch topology.

Question 3

Which of the following is NOT a characteristic of Fiber Optic cabling?

1. It is the easiest cable to work with due to its ability to be run over longer distances without attenuation.
2. It is more expensive that coaxial cable or twisted-pair.
3. It is resistant to eavesdropping and interferance.
4. Data travels as light over a glass or plastic medium.

Answer 3

1. It is the easiest cable to work with due to its ability to be run over longer distances without attenuation.

___________________________________________

Although Fiber optic cabling can be run over longer distances without attenuation (loss of signal over distance) it is harder to work with than either Coaxial cable or Twisted-Pair.

Question 4

What is the #1 cause of network disruption?

1. Cabling Problems.
2. Magnetic Fields.
3. DOS Attacks.
4. Undercapacity.t

Answer 4

1. Cabling Problems

At the Layer 1, the Physical layer.

Question 5

What comprises Layer 3 of the Open Systems Interconnection (OSI) Model?

1. Session.
2. Network.
3. Data Link.
4. Transport.

Answer 5

Layer 3 is the Network layer.

Question 6

What comprises Layer 6 of the Open Systems Interconnection (OSI) Model?

1. Physical.
2. Presentation.
3. Data Link.
4. Session.

Answer 6

Layer 6 is the Presentation layer.

Question 7

What comprises Layer 2 of the Open Systems Interconnection (OSI) Model?

1. Application.
2. Network.
3. Data Link.
4. Sesson.

Answer 7

Layer 2 is the Data Link layer.

Question 8

What comprises Layer 4 of the Open Systems Interconnection (OSI) Model?

1. Session.
2. Presentation.
3. Data Link.
4. Transport.

Answer 8

Layer 4 is the Transport layer.

Question 9

What is the PRIMARY purpose of the Open Systems Interconnection (OSI) Model?

1. To create a standard architecture for Cisco networks.
2. To create a secure network architecture which imposes secure protocols
3. To create an efficient and practical network architecture that can be deployed at minimal cost.
4. To create a vendor agnostic design that standardizes network communication functions.

Answer 9

4. To create a vendor agnostic design that standardizes network communication functions.

_________________________________________

The Open Systems Interconnection model (OSI model) is a conceptual model for network protocol design. It’s referenced when troubleshooting or describing network operations, but is NOT USED in day-to-day network operations.

Question 10

What comprises Layer 7 of the Open Systems Interconnection (OSI) Model?

1. Application.
2. Presentation.
3. Data Link.
4. Session.

Answer 10

Layer 7 is the Application layer.

Question 11

What comprises Layer 1 of the Open Systems Interconnection (OSI) Model?

1. Physical.
2. Network.
3. Applications.
4. Sesson.

Answer 11

Layer 1 is the Physical layer.

Question 12

Which of the following statements is TRUE about Synchronus Transmissions?

1. Bits are sent sequentially.
2. Start and Stop bits are used.
3. It is primarily used to send large amounts of data.
4. It is the transmission format used by most modems.

Answer 12

3. It is primarily used to send large amounts of data.

__________________________________________

Sending bits sequentially, using start and stop bits, and being the most common transmission format for modems are all characteristics of Asynchronous Transmissions.

Question 13

What is meant by Noise on copper cable?

1. Loss of signal strength over distance.
2. When signal from one line spills over to another.
3. Undesirable signals which degrade, distort, or interfere with data signals.

Answer 13

2. When signal from one line spills over to another.

_______________________________________

Loss of signal strength over distance is Attenuation.

Undesirable signals which degrade, distort, or interfere with data signals is Cross-talk, which is a type of noise.

Question 14

Which of the following statements is FALSE about Asynchronus Transmissions?

1. Bits are sent sequentially.
2. Start and Stop bits are used.
3. It is primarily used to send large amounts of data.
4. It is the transmission format used by most modems.

Answer 14

3. It is primarily used to send large amounts of data.

__________________________________________

Asynchronous Transmissions are primarily used when sendng small amounts of data.

Question 15

What is meant by Attenuation on copper cable?

1. Loss of signal strength over distance.
2. When signal from one line spills over to another.
3. Undesirable signals which degrade, distort, or interfere with data signals.

Answer 15

1. Loss of signal strength over distance.

_______________________________________

When signal from one line spills over to another is called Noise.

Undesirable signals which degrade, distort, or interfere with data signals is Cross-talk, which is a type of noise.

Question 16

Which layerat comprises Layer 1 of the Open Systems Interconnection (OSI) Model?

1. Physical.
2. Network.
3. Applications.
4. Sesson.

Answer 16

Layer 1 is the Physical layer.

Question 17

What are the three most common cable media that are used to connect systems to a network?

1. Coaxial, 10BaseT, 100BaseT
2. Coaxial, Twisted Pair, Fiber Optic
3. Twisted Pair, Shielded, Plenum
4. Binary, Shielded, Twisted Pair

Answer 17

2. Coaxial, Twisted Pair, Fiber Optic

Question 18

Which of the following statements is TRUE?

1. Analog Transmissions on allow one signal at a time or there is a collision.
2. Digital Transmissions produce a continuous signal.
3. Digital Signals have a varied amplitude.
4. Digital Transmissions emit pulses represented by the binary digits 0 or 1.

Answer 18

4. Digital Transmissions emit pulses represented by the binary digits 0 or 1.

__________________________________________

Analog signals can do broadband with multiple signals combined.

Digital signals emit pulses. There is not a continuous signal nor does it vary in amplitude.

Question 19

What comprises Layer 5 of the Open Systems Interconnection (OSI) Model?

1. Session.
2. Presentation.
3. Data Link.
4. Transport.

Answer 19

Layer 5 is the Session layer.

Question 20

Which OSI Layer is concerned with the transmission of raw data across the network?

1. Data Link Layer.
2. Physical Layer.
3. Transport Layer.
4. Session Layer.

Answer 20

1. The Physical Layer.

_______________________________________________________

The Data Layer….

The Transport Layer…

The Session Layer…

Question 21

Which OSI layer detects and recovers from errors on physical layer?

1. Data Link Layer.
2. Physical Layer.
3. Transport Layer.
4. Session Layer.

Answer 21

1. Data Link Layer.

Question 22

Which of the following is NOT performed by the OSI Data Link layer?

1. Provides error-free transmission from one node to the next.
2. Defines the way data is written to the media.
3. Establishes and terminates links between nodes.
4. Responsible for traffic control.

Answer 22

2. Defines the way data is written to the media.

_______________________________________

The Physical Layer defines how data is written to the media.

Question 23

Which OSI layer is responsible for retransmitting data for which it did not receive an acknowledgement?

1. Tranport Layer.
2. Session Layer.
3. Data Link Layer.
4. Physical Layer.

Answer 23

3. Data Link layer.

Question 24

Which OSI layer is responsible for the transmission of raw data across the network ?

1. Tranport Layer.
2. Session Layer.
3. Data Link Layer.
4. Physical Layer.

Answer 24

4. Physical Layer

Question 25

Which OSI layer determines the best physical path for data to travel? 1. Tranport Layer. 2. Physical Layer. 3. Network Layer 4. Data Link Layer.

Answer 25

3. Network Layer

Question 26

Which layer of the OSI model is responsible for translating logical addresses into physical addresses? 1. Session Layer. 2. Physical Layer. 3. Network Layer 4. Data Link Layer.

Answer 26

3. Network Layer.

Question 27

Which layer of the OSI model is responsible for Routing data? 1. Session Layer. 2. Physical Layer. 3. Transport Layer 4. Network Layer.

Answer 27

4. Network Layer.

Question 28

Which layer of the OSI model is responsible for Message Segmentation? 1. Transport Layer. 2. Presentation Layer. 3. Session Layer. 4. Network Layer.

Answer 28

1. Transport Layer. \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ **Message Segmentation** splits message into smaller units passes the smaller units to the network layer. The Transport layer reassembles segmented messages at destination.

Question 29

Which layer of the OSI model is responsible for Session Multiplexing? 1. Session Layer. 2. Presentation Layer. 3. Transport Layer. 4. Network Layer.

Answer 29

3. Transport Layer. \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ **Session Multiplexing** breaks the data coming in on one link into separate data streams called *sessions*. The transport layer tracks which message belongs to which session.

Question 30

Which of the following is NOT a function of the Transport layer? 1. Ensures messages delivered error-free 2. Ensures messages delivered in sequence 3. Determines the best phyical path for data to travel. 4. Ensures messages delivered without loss or duplication

Answer 30

3. Determines the best phyical path for data to travel. \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ Determining the best physical path for data to travel is the responsibility of the Network Level.

Question 31

Establishment Maintenance Termination • Allows application processes on different machines to do several things between the machines • Allows processes to establish a connection • Allows processes to use a connection • Allows processes to terminate a connection • Each connection called a session Session Support • Performs the function of allowing processes communicate over network • Performs security • Performs name recognition • Performs logging on

Answer 31

Session Layer • Responsible for establishing sessions between processes running on different computers • Provides several functions to accomplish this • Session establishment, maintenance, and termination • Session support

Question 32

Presentation Layer • Formats data to be presented to the application layer • Translator for the network • At sending station translates data from application layer format to common format • At receiving station translates data from common format to format used by application layer

Answer 32

• Character code translation ASCII to EBCDIC (for graphics) • Data conversation Bit order CR-CR/LF Integer-floating point Data compression Reduces number of bits needed to transmit data Data encryption Encryption of data for security purposes Encryption of passwords

Question 33

Application Layer • Serves as window for uses and applications to access network services • Provides a variety of commonly used functions

Answer 33

Application Layer Common Functions • Resource sharing • Device redirection • Remote file access Remote printer access * Network management * Directory services * Email * Instant messaging