IS-231 Chapter 1

fragmentation

If a Network layer protocol is aware that a packet is larger than the maximum size for its network, it will divide the packet into smaller packets in a process known as:

​Transport layer

The segment or datagram protocol data unit exists at what layer of the OSI model?

​frame

What is the name for the protocol data unit (PDU) ​of the Data Link layer?

​demarcation point

The point of division between a telecommunications service carrier’s network and a building’s internal network.

convergence​

​The use of data networks to carry voice, video, and other communications services in addition to data.

​segment

​(1) A unit of data that results from subdividing a larger protocol data unit. (2) A part of a network. Usually, a segment is composed of a group of nodes that share the same communications channel for all their traffic.

fail open

System default that allows access during a system or network failure.

electrostatic discharge (ESD)

The transfer of electrical charge between two bodies, such as when a technician touches a computer component.

​global account

​A user’s domain-level account, also called a global username or network ID, which is assigned by the network administrator and is kept in Active Directory.

bandwidth

(1) The amount of traffic, or data transmission activity, on a network. (2) A measure of the difference between the highest and lowest frequencies that a medium can transmit.

upset failure

​Damage that can shorten the life of a component and/or cause intermittent errors.

fail close

System default that denies access during a system or network failure.​

Payload

​Data that is passed between applications or utility programs and the operating system, and includes control information.

They centralize user account logins

Which of the following is not one of the disadvantages of peer-to-peer networks?

​node

Any computer or device on a network that can be addressed on the local network is referred to as a:

​bus topology

In what network topology are devices daisy-chained together in a single line?​

​Layer 7

HTTP, IMAP4, FTP, and Telnet are all examples of protocols that operate at what layer of the OSI model?

​Session Layer

What layer of the OSI model describes how data between applications is synced and recovered if messages don’t arrive intact at the receiving application?​

​encapsulation

The process of adding a header to the data inherited from the layer above is called what option below?

​SMTP

What mail protocol is used to send mail messages to a server?

​star topology

What physical network topology consists of all connected devices connecting to one central device, such as a switch?

global account

When using a Windows domain, what is the domain-level account for each user known as?​

False

Servers that have a NOS installed require less memory, processing power, and storage capacity that clients because servers are called on to handle only light processing loads and requests from multiple clients.​

True

The fundamental difference between a switch and a router is that a switch belongs only to its local network and a router belongs to two or more local networks.

​demarc

The device where a telecommunications service provider network ends and an organization’s network begins is referred to as what option below?

True

After a problem and its symptoms have been identified, a theory regarding a probable cause should be established.

False

The protocol data unit for the Physical layer of the OSI model is payload, or data.​

Presentation

Select the layer of the OSI model that is responsible for reformatting, compressing, and/or encrypting data in a way that the application on the receiving end can read:

convergence

Using the same network to deliver multiple types of communications services, such as video, voice, and fax, is known as:

Layer 2

A standard network switch operates at what layer of the OSI model?

Network

At what layer of the OSI model do the IP, ICMP, and ARP protocols operate?​