OSI Model

What is the Protocol Data Unit (PDU) employed at the Transport Layer? Segments Bits Frames Packets None of these choices

Segments

Which layer establishes, maintains, and terminates communications between applications located on different devices? a. application b. presentation c. session d. network e. data link

Session

A user is trying to connect to another computer, but the logon attempt is continually rejected.

Session layer

Manages ongoing conversations between two computers

Session layer

Which of the following are transport layer protocols? a. TCP and UDP b. IP c. FTAM d. IP and TFTP e. TFTP

TCP and UDP

Which of the following are presentation layer standards? a. MIDI b. TIFF c. JPEG d. MPEG e. GIF f. All of the above

All of the above

The File Transfer Protocol (FTP) corresponds to which OSI layer? Application Presentation Session Transport None of these choices

Application

Provides access to network services

Application layer

You can ping a computer that you are trying to transfer files to via FTP, but you can't communicate using FTP.

Application layer

You try to access a Linux server to share files using NFS. You can communicate with the server, but the shared files don't appear to be available.

Application layer

Which of the following are benefits of using a layered network model? A . it specifies how changes to one layer must be propagated through the other layers B . it facilitates troubleshooting C . it focuses on details rather than general functions of networking D . it breaks the complex process of networking into more manageable chunks E . it allows layers developed by different vendors to interoperate.

B, D, and E

Which of the following are considered to be the upper layer protocols? a. presentation and session b. application and presentation c. application, presentation, and session d. application, presentation, session, and transport e. application

C. Application, presentation, and session

Bits are packaged into frames at which layer of the OSI model? Data link Transport Physical Presentation Application

Data link

Bridges operate at which layer of the OSI model? a. physical b. data link c. transport d. network e. session

Data link

The _____ layer adds physical address information and a CRC to create a Frame.

Data link

Defines how computers access the media

Data link layer

(T or F) Most logical addresses are preset in network interface cards at the factory?

False

(T or F) The Media Access Control (MAC) sublayer provides an interface to the Network layer protocols, manages flow control, and issues requests for transmission for data that has suffered errors.

False

What are the sublayers of the data link layer? a. MAC and IPX b. hardware and frame c. MAC and LLC d. WAN and LAN e. TFTP and telnet

MAC and LLC

Which of the following operate at the presentation layer? A . MIDI B . FTP C . SMTP D . TFTP E . JPEG

MIDI and JPEG

IP is implemented at which OSI model layer? Network Transport Session Data link Logical link control

Network

IP is implemented at which OSI model layer? a. transport b. session c. data link d. network e. logical link control

Network

Packets are found at which layer? a. data link b. transport c. network d. session e. physical

Network

Routers operate at which layer of the OSI model? Physical Transport Network MAC sublayer of the data link layer Session

Network

Which layer translates between physical and logical addresses The MAC sublayer of the data link layer Transport Physical Application Network

Network

Bit synchronization is handled at which layer Data Link Session Transport Presentation Physical

Physcial

What layer of the OSI model places the signal on the cable? Physical Network Data Link Transport Host-to-Host Session

Physcial

Repeaters and hubs operate at which layer? a. network b. data link c. transport d. physical e. session

Physical

Match the protocol data unit (PDU) to the corresponding layer(s) of the OSI model

Physical - Bits Transport - Segment Network - Packet Data Link - Frame Presentation - Data Application - Data Session - Data

A computer won't connect to the network. After some investigation, you find that the patch cable isn't terminated properly.

Physical layer

All computers connected to a particular hub have lost network connectivity. You determine that the hub is the problem.

Physical layer

You check some statistics generated by a network-monitoring program and discover that an abnormally high number of CRC errors were detected.

Physical layer

What does the Transport layer use to determine which Application layer service should receive the message?

Port number

Encryption takes place at which layer? a. application b. presentation c. session d. transport e. data link

Presentation

Which layer handles the formatting of application data so that it will be readable by the destination system? a. application b. presentation c. session d. transport e. data link

Presentation

Handles data formatting and translation

Presentation layer

You receive an encrypted text file, but when you open it, the text is unreadable. You determine that decryption did not take place as it should have.

Presentation layer

In OSI, the term PDU stands for ______ Protocol Data Unit Private Data Unit Protected Data Unit Public Data Unit None of these choices

Protocol Data Unit

Which device works on the Data Link Layer? Bridge Gateway Router Repeater Hub Multiport Repeater

Bridge

A(n) _____ is a structured package for moving data that includes not only the raw data, or payload, but also the sender's and receiver's network addresses, and error checking and control information.

Frame

Which of these network devices belongs at the OSI physical layer (layer one)? Repeater Router Switch Bridge None of these choices

Repeater

What does OSI stand for? a. international standards organization b. open systems interconnect c. operating standard information d. operating system interconnection e. open systems interface

Open Systems Interconnect

Converts bits into signals for outgoing messages

Physical layer

Which of the following implement the OSI physical layer? All of these choices Ethernet Token Ring FDDI Ethernet and Token Ring

All of these choices

The layers of the osI model, from the top down, are:

Application, presentation, session, transport, network, data link, physical

What is the Protocol Data Unit (PDU) employed at the Physical Layer? Bits Frames Packets Segments Messages

Bits

Which device resides on both the Network and the Data Link Layer of the OSI model? Brouter Router Bridge Hub Modem Multiport Repeater

Brouter

(T or F) The network layer uses physical addresses to route data to destination hosts?

False

Order the components of the completed frame from left to right

Frame header, packet header, segment header, data, CRC

The _____ layer adds logical addressing information.

Network

Which layer translates between physical (MAC) and logical addresses? a. network b. data link c. transport d. physical e. session

Network

A computer can access resources on the local LAN but no on a different subnet. You find that the computer's default gateway isn't configured correctly.

Network layer

Provides best path selection in an internetwork

Network layer

You inspect a computer that isn't able to communicate with other computers. You find that IPX\SPX instead of TCP\IP is installed on that computer.

Network layer

The Internet Protocol (IP) generally corresponds to which OSI layer? Network (layer three) Transport(layer four) Data link(layer two) Session(layer five) None of these choices

Network(layer three)

Which of these network devices primarily functions at the OSI Network layer (layer 3)? Router Switch Gateway Hub All of these choices

Router

Error detection and recovery takes place at which layer? a. transport b. presentation c. data link d. application e. network

Transport

Flow control takes place at which layer? a. physical b. transport c. network d. MAC sublayer of the data link layer e. session

Transport

The _____ layer adds port and sequencing information.

Transport

Which layer is responsible for packet sequencing, acknowledgments, and requests for retransmission? a. the MAC sublayer of the data link layer b. transport c. physical d. application e. network

Transport

Breaks long data streams into smaller chunks

Transport layer

One of your servers has been exhibiting sluggish network performance. You use a network-monitoring program to try to evaluate the problem. You find considerable TCP retries occurring because the server is being overwhelmed by data and packets are being discarded.

Transport layer