Introduction to Networking

The Transport Layer is not concerned with which of the following?

A. Addressing B. Connection management C. Flow control D. Buffering

Which two characteristics set the cost of CPU?

A. Clock speed B. Bus size

Which of the following is managed by the OS?

A. Keyboard input B. Screen display C. File I/O D. Peripheral Control

The Open Systems Interconnect Reference Model Presentation Layer does which of the following?

A. Manages the way computers read information. B. Is where information can be encrypted. C. Is concerned with the order of bytes and integers.

The session Layer is concerned with which of the following?

A. Managing dialog B. Beginning dialog C. Ending dialog

What is the difference between multiplexing and parallelization?

A. Multiplexing allows concurrent unique network requests. B. Parallelization allows a unique request over multiple paths.

Which of the following errors can be detected and reported by the physical layer?

A. Wire shorts B. Open connections

Fiber optic cabling is most often used for: (Select 2 answers)

A.- Connections between floors B.- Long backbone connections

Which of the following cable types uses a BNC T-connector to connect each NIC to the cable?

Thin-net

Most OSI model protocol layers add headers to the data they transmit. The Data Link Layer also adds a trailer. What is the purpose of the trailer?

To carry the frame check sequence

What is the purpose of a MAC address?

To identify a frame to the next NIC.

What does a receiving layer do to information that has been passed up from a layer below?

Decapsulate

The process of translating secured data so that it can be understood by a user program is called what?

Decryption

Which of the following describes the purpose of cladding in a fiber optic cable?

To reflect light as it passes through a cable

Which of the following is the primary purpose of a Network Layer protocol?

Transmit packets across a network

Which OSI/RM Layer combines several sessions into a single conversation?

Transport

The Session Layer interacts with which two other layers?

Transport and Presentation

Which layer uses port numbers for communication?

Transport layer

In the term "10BaseT" what does the "T" mean?

Twisted pair

Which of the following is an example of a Transport Layer protocol?

UDP

The Session Layer offers user focused services like all of the following except for:

Determines the best path a conversation can take through a network.

Who creates a device driver?

Device Manufacturer

Each light pulse or light ray that passes through a cable is called a "mode." Modal dispersion is when:

Different light pulses travel greater distances within the same fiber optic cable

To prevent cloning of copyrighted materials, what code was integrated into the Microsoft kernel?

Digital Rights Management

What happens at each layer of a protocol stack during data transmission?

Each layer adds its own protocol header to the transmission request.

What is the main advantage of star topology?

Ease of Management

An Ethernet NIC adds a header and trailer to data before it transmits it. This is an example of which of the following?

Encapsulation

What do you call the act of reordering data for security purposes.

Encryption

The Network Layer moves data in which of the following ways?

End-to-End

What type of physical medium uses light to represent binary information?

Fiber-optic cable

In a 10BaseT star topology, which of the following performs the logical function of a bus?

Hub

The most common topology for corporate WANs is which of the following?

Hybrid

Which type of cabling is most commonly installed for a LAN?

Unshielded twisted pair cable (UTP)

Which type of cabling is most sensitive to the high levels of electromagnetic interference/radio frequency interference (EMI/RFI) common in elevator shafts?

Unshielded twisted-pair(UTP)

Name the two types of fiber optic cables used to transmit data.

Multimode Single mode

Name the OS function that can allow one program to run on multiple CPUs.

Multiprocessing

Which OS function can allow more than one program to run at a time?

Multitasking

Which OS function allows many concurrent users?

Multiuser

In order to communicate, peer entities:

Must use the same protocol

Which type of address is unique anywhere in the world?

NIC address

Which of the following devices does not operate on the physical Layer of the OSI Reference Model?

Network Interface Card

On a 10BaseT network, what happens when the number of communicating nodes decreases?

Network performance increases because of fewer collisions

Select the bus with the fastest transfer rate

PCI

Name the bottom four layers of the OSI model from the bottom.

Physical, Data Link, Network, Transport

Which of the following is a radio frequency wireless technology most often used for?

Point to point Transmission

Compressed data is a function of which of the following layers?

Presentation Layer

it add a protocol header to the data added to a message that provides information About the message is called which of the following?

Protocol header

Why have the model? What precisely does it do for networking?

Provides a logical structure to inform network concepts

Which computer component component temporarily stores programs for processing?

RAM

Explain the difference between RAM and ROM

RAM is empty when the machine is powered off

The amount of RAM determines which of the following:

The amount of instructions and data available to the CPU

What does it mean when a computer runs in headless mode?

The computer has no monitor or keyboard

What is the biggest challenge to the growth of wireless networking?

The limited supply of usable electromagnetic frequencies

What happens when a data application on a local computer is instructed to display Records store on another computer?

The local computer's redirection software intercepts the request that would normally Go straight to its operating system (OS)

How does a request for data from a network site get from the computer's central Processing unit (CPU) to the network?

The request travels across the computer's local bus, to its network interface card (NIC).

Describe what can happen on a network that does not have a method of flow control.

The sending node may overwhelm the receiving node with data.

Which OSI model layers are concerned primarily with applications?

The top three

Using decimal numbering, how many characters could be sent?

10,000

n a typical 10BaseT network, which of the following is the maximum distance a signal can be sent over twisted pair?

100 meters

What is a NIC, and what is it used for?

A NIC sends and receives network signals

What is a port number, and how does the Transport Layer use it?

A port number identifies a software process.

Communication programs are arranged in layers to do which of the following?

Allow programs are arranged in layers to do which specialized services

Ethernet uses a layer one encoding scheme called manchester encoding. Which of the following describes manchester encoding?

An Ethernet one value equals a rise in voltage during a clock tick.

A wave that is one ten-millionth of a millimeter is called:

Angstrom

Which of the following network topologies connects devices to a shared straight-line cable?

Bus topology

Which of the following is not a type of punch-down block?

CPE

Light stays within a fiber optic cable by bouncing off what part of the fiber?

Cladding

In a client/server arrangement, requests are normally generated by the:

Client

Which of the following would not be used in a typical star topology?

Coaxial Cable

Virtual circuits are used in what types of networks?

Connection-oriented, Packet-switched networks

The Internet is the best example of what type of network?

Connectionless, Packet-switched network

Which of the following jobs are not allocated to the Data Link Layer of the receiving node?

Controls access to a shared medium.

What does I/O stand for?

Input / Output

Which Network Layer protocol sends control and error messages across a network?

Internet Control Message Protocol (ICMP).

Which Network Layer protocol sends a message to a group of devices based on membership?

Internet Group Management Protocol (IGMP).

Which Network Layer protocol is used to move packets across the Internet?

Internet Protocol (IP).

When a process receives data from the layer above, What does it do with that data?

It adds a protocol header to the data

if a protocol receives data from below, what does it do?

It removes the protocol header from the data

Why is it expensive to install fiber optic cable?

It requires specialized tools and training

If a protocol receives data from above that is too long for it to handle, what does it do?

It segments the data into smaller chunks

Which of the following causes the propagation delay of a GEO satellite?

Long distance between the satellite and Earth

The EIA/TIA-568 standard does not offer guidelines for which of the following?

Maximum performance specifications for cables and connectors

What part of the electromagnetic spectrum do wireless LANs use?

Microwave

Which device is associated with short-term storage?

Random Access memory

Which server type does not offer file sharing?

SNMP server

What is a computer that shares resources with other computers called?

Server

A NIC is a device used for:

Signaling

Which technology will carry a signal the greatest distance without a repeater?

Single Mode

Which of the following is the most widely used LAN topology?

Star

What is the difference between a 10Base2 network and a 10BaseT network?

The Cabling

Which of the following uses a connectionless protocol network?

The Internet

A port number only identifies a software process. How does a Transport Layer message get to the computer that hosts that process?

The Network Layer finds the symbolic computer address. The Data Link Layer addresses the data to a particular hardware device.

The UNIX protocol stack which includes TCP and IP, does not correspond exactly to the OSI reference model. Why?

The OSI reference Model was developed after UNIX.

Arrange the items below in a logical stack to show how request flows down from a User application, over a network, and to a server application.

User application, redirector software, network communications protocols, network interface card (NIC), physical layer, network operating system (NOS), server application.

When is UTP cable preferred over STP?

When there is little electrical interference

What determines the size of a bus?

Width

Which of the following operating systems is not based on open source software?

Windows Vista

Which of the following types of radiated energy have a wavelength shorter than the Color green and blue

X-rays

Why are twisted pair wires twisted?

o reduce the effects of electromagnetic fields