Introduction to Networking - Chapter 1

What is the fundamental distinction between a MAN and a WAN?

*MAN* is a group of connected LANs in the *same geographical area*. *WAN* is a group of connected LANs *spread over a wide geographical area*.

What is a message called that is delivered by TCP? What is a message called that is delivered by UDP? At which layer do the two protocols work?

*TCP = segment* *UDP = datagram* Both reside on the Transportation Layer

A computer is unable to access the network. When you check the LED lights near the computer's network port, you discover the lights are not lit. Which layer of the OSI model are you using to troubleshoot this problem? At which two layers does the network adapter work?

- Physical layer - Link layer

PDU

Protocol Data Unit - group of bits a message or a transmission

What is the fundamental distinction between a node and a host?

A *host* is any computer on a network that host's a resource such as an application or data. A *node* is any computer/device that can be addressed on the local network.

What is the fundamental distinction between a Layer 2 switch and a router?

A switch relays data inside the network, whereas a router routes data outside of the network

What is the name of the domain controller database that Windows Server 2012 R2 uses to store data about user access and resources on the network?

Active Directory

Suppose one computer is upgraded from Windows 7 Professional to Windows Server 2012 R2. Which networking model can the network now support that it could not support without the upgrade?

Client Server Network Model, now data is accessible to the user at any computer on the network.

List three types of services a network might support that are considered part of the unified communications or convergence.

Conversational voice streaming live audio & voice streaming stored audio and voice

What is a PDU (Protocol Data Unit) called at the Link layer?

Frame

In the client-server model what is the primary protocol used for communication between a browser and a Web server?

HTTP

Which email protocol allows an email client to read mail stored on the mail server?

IMAP4

What is the primary protocol used at the Network layer?

IP (Internet Protocol)

At the Network layer, what type of address is used to identify the receiving host?

IP Address

A user complains that Skype drops her video conference calls and she must reconnect. At which layer of the OSI model should you begin troubleshooting? Which OSI layer is responsible for not dropping the Skype connection?

Layer 5: Session Layer ⇒ responsible for maintaining how data is synced and recovered. Layer 7: Application Layer ⇒ may be improper setup of the application settings which does not match the other host computer

A user complains that he cannot access a particular Website, although he is able to access other Web sites. At which layer of the OSI model should you begin troubleshooting the problem?

Layer 7: Application Layer

At the Link layer, which type of network address is used to identify the receiving node?

MAC Address

Which email protocol allows an email client to download email messages to the local computer?

POP3

At the Network layer, what is a message called?

Packet

A network consists of 10 computers, all running Windows 7 Professional. One computer acts as a file server and serves up data to other computers on the network. Which model does the network use?

Peer to peer network model

Which type of address is used at the Transport layer to identify the receiving application?

Port address

Which session layer protocol is a streaming live video teleconference likely to use on the network?

RTP (Real-time Transport Protocol)

Which application embedded in Windows operating systems allows remote control of a computer and uses the RDP secure protocol for transmissions?

Remote Desktop

What service provided by Windows Server 2012 R2 allows a computer to serve up applications to other computers on the network?

Remote Desktop Services

Which two encryption protocols might be used to provide secure transmissions for browser and Web server communications?

SSL and TLS

Suppose a new switch is connected to the first switch by way of a network cable and 3 computers are connected to the new switch. Which Network topology is now used?

Star Bus Topology

A network consists of seven computers and a network printer all connected directly to one switch. Which network topology does this network use?

Star Topology

Which client-server application allows an administrator to control a remote computer, but does not encrypt or secure the communication between the client and server?

Telnet

Why is it important to wear an ESD strap when installing a server in a rack?

To prevent an electrostatic discharge to the user or the machine, which has parts that are sensitive to electric shock.

Is TCP or UDP normally used when streaming live video? Why?

UDP, it's considered a connection-less protocol/ best effort protocol as it will send the data but it may never reach it's intended client. Also it's known to be faster than TCP protocol.

Apache is a popular example of what type of networking software?

Web server