EXAM 1 PREP

• Which of the following would be a standard or protocol used at the Data Link layer of the Internet or OSI model?

  Ethernet
• A junior network administrator has used the wrong cable type to connect his/her computer to the administrative port on a router and cannot establish a terminal session with the device. What layer of the Internet model does this problem appear to reside at?

  Physical
• Which of the following is not an application layer standard?

  T1
• At the transport layer in the Internet model, TCP is responsible for breaking large files received from the application layer into smaller messages and opening a connection to a server for transferring them.


  True
• A(n) _____________ is a set of rules that determine what a layer would do and provides a clearly defined set of messages that software at the layer needs to understand.

  Protocol
• The fourth layer of the OSI model is called the __________ layer.

  transport
• The _________ layer is responsible for routing of messages from the sender to the final destination.

  network layer
• A(n) _________ is a LAN that uses the same technologies as the Internet but is open to only those inside the organization.

  intranet
• The bottom section of Wireshark's captured packets display screen shows:

  a hexadecimal dump of data bytes in the packet, along with an ASCII interpretation of the bytes.
• Which of the following is not true about Telnet?

  Telnet does not pose a security threat.
• What technique is used by most videoconferencing applications to reduce the amount of data being transmitted?

  compression
• Which of the following is not an example of a mail user agent software package?

  Microsoft Word
• With the two-tier client-server architecture, the server is responsible for the ________ logic.

  data access
• All three parts (request line, request header, request body) of an HTTP request from a web browser to a web server are required when a request is made.

  False
• The protocol that makes it possible for a Macintosh web browser to be able to retrieve a Web page from a Microsoft Web server is called the _____________________.

   

  Hypertext Transfer Protocol
• A "thin client" approach places most of the application logic on the client.

  False
• In the three tier architecture, the software on the client computer is responsible for the ____________.

  presentation logic
• Client-server architectures:

  can use middleware to provide a standard way of communicating between software from more than one vendor
• The standards H.320, H.323, and MPEG-2 are commonly used with

  Videoconferencing
• ____________ is one of the most commonly used coding schemes used in data transmission.


  ASCII
• Data is physically transmitted from one computer or terminal to another in the ________ layer.

  physical
• __________ is a line-of-sight type of wireless media.

  microwave
• WDM is a version of FDM used in fiber-optic cables.

  True
• ____________ refers to the transmission characteristics of the circuit.

   

  logical circuit
• Baud rate, or symbol rate, is the number of bits transmitted per second.

  False
• A(n) ___________ divides one high-speed communication circuit into several lower speed circuits for the primary reason of saving communication line costs.

  multiplexer
• Manchester encoding is a special type of bipolar signaling in which the signal is changed from high to low or from low to high in the middle of the signal.

  True
• Two fundamentally different types of data are:

  digital and analog
• Data compression can increase the throughput of a communication link.

  True
• With contention:


  computers wait until the circuit is free before they send data
• Optical media is:

   

  less likely to suffer from noise than electrical media
• With roll-call polling, a server polls clients in a consecutive, pre-arranged priority list.

  True
• ARQ means that:

  a receiver that detects an error in a message simply asks the sender to retransmit the message until it is received without error
• On digital circuits, we use _________ to reshape the incoming signal and mitigate the effects of attenuation.

  repeaters
• Which of the following is way to reduce or eliminate crosstalk on a circuit?

  physically separating the cables from other communication cables
• ____________ is not a function of a data link protocol.

  Amplitude shift keying
• Stop-and-wait ARQ uses ___________ type of data flow.

  half duplex
• Token passing is a term that refers to hub polling, in which one computer starts a poll and passes it to the next computer on a multipoint circuit.

  True 
• Calculating the actual throughput of a data communication network is:

  complex because many factors affect throughput