Introductions to Networks

In what type of network are all computers considered equal and do not share any central authority?

(A. Peer-to-peer) In a peer-to-peer network, all computers are considered equal. It is up to the computer that has the resource being requested to perform a security check for access rights to its resources.

What type of topology gives you a direct connection between two routers so that there is one communication path?

(A. Point-to-point) As its name implies, in a point-to-pint topology you have a direct connection between two routers, giving you one communication path. The routers in a point-to-point topology can either be linked by a serial cable, making it a physical network, or be far away and only connected by a circuit within a Frame Relay network, making it a logical network.

Which type of WAN technology uses labels, which enables priority of voice through the network?

(C. MPLS) Multiprotocol Label Switching has as many advantages as a LAN protocol. When labels are used, voice can have priority over basic data, for example.

What is the difference between a LAN and a WAN?

(D. All of the above..."WANs require a router" "WANs cover larger geographical areas" "WANs can ulitlize either private or public data transport" A typical WAN connects two or more remote LANs together using someone else's network (your ISP's) and a router. Your local host and router see these networks as remote networks and not as local networks or local resources. Routers use proprietary serial connections for WANs

You have a network with multiple LANs and want to keep them separate but still connect them together so they can all get to the Internet. Which of the following is the best solution?

(D. Install a router) Routes are used to connect different networks together.

Which of the following provides the most physical layout flexibility in a very large, geographically dispersed enterprise network?

(D. MPLS cloud network) Multiprotocol Label Switching provides logical links between sites, so branch offices can be easily and quickly added.

Which type of topology has the greatest number of physical connections?

(D. mesh) In the mesh topology, there is a path from every connection to every other one in the network. A mesh topology is used mainly because of the robust fault tolerance it offers--if one connection goes on the blink, computers and other network devices can simply switch to one of the many redundant connections that are up and running.

What are the three basic LAN topologies?

Bus, ring, and star

What is the term for device that shares its resources with other network devices?

Server

Will a computer that shares no resources most likely be connected to the backbone or to a segment?

A Segment

Which LAN topology is characterized by all devices being daisy-chained together with the devices at each end being connected to only one other device?

Bus

What device is generally implemented as a star topology?

Multiprotocol Label

Which network topology or connection type can be implemented with only two endpoints?

Point-to-point

What does WAN stand for?

Wide Area Network

What common WAN topology often results in multiple connections to a single site (leading to high degree of fault tolerance) and has one-to-many connections?

Multiprotocol Label Switching (MPLS)

What does MPLS stand for?

Multiprotocol Label Switching (MPLS)

When designing a network and deciding which type of network topology to use, which item(s) should be considered? (Select all that apply.)

(A. "Cost" B. "Ease of installation" C. "Ease of maintenance" D. "Fault-tolerance requirements") Each topology has its own set of pros and cons regarding implementation, so it's important to ask the right questions and consider cost, ease of installation, maintenance, and fault tolerance.

Which of the following is an example of hybrid network?

(A. Ethernet switch) The best answer to this question is an Ethernet switch, which uses a star physical topology with logical bus technology.

Which of the following is an example of when a point-to-multipoint network is called for?

(A. When a centralized office needs to communicate with many branch offices) When a central office, such as headquarters, needs to communicate directly with its branch offices but the branches do not require direct communication with one another, the point-to-multipoint model is applicable. The other scenarios tend to indicate the use of a point-to-point link between sites.

Which network topology is a combination of two or more types of physical or two or more types of logical topologies?

(B. Hybrid) A hybrid topology is a combination of two or more types of physical or logical network topologies working together within the same network.

What is a logical grouping of network users and resources called?

(B. LAN) A logical grouping of hosts called a LAN, and you typically group them by connecting them to a hub or switch

In a physical star topology, what happens when workstation loses its physical connection to another device?

(B. Only that workstation loses its ability communicate.) In a star topology, each workstation connects to a hub, switch, or similar central device but not to other workstations. The benefit is that when connectivity to the central device is lost, the rest of the network lives on.

Which of the following is a disadvantage of the star topology?

(B. When the central concentrating device experiences a complete failure, all attached devices lose connectivity to the rest of the network.) The only disadvantage mentioned is the fact that there is a single point of failure in the network. However, this topology makes trouble shooting easier; if the entire network fails, you know where to look first. The central device also ensures that the loss of single port and the addition of a new device to an available port do not disrupt the network for other stations attached to such a device.

You need a network that provides centralized authentication for your users. Which of the following logical topologies should you use

(C. Client-server) A client server logical topology allows you to have a centralized database of users so that authentication is provided in one place

You need a topology that is scalable to use in your network. Which of the following will you install?

(C. Star) To install a physical toplogy that provides ease of scalability, use a star network. This is a hub or switch device, and this is the most common LAN network today.

Which of the following is a concern when using peer-to-peer networks?

(C. The security associated with such a network) It is easy to relax about security in a peer-to-peer environment. Because of the trouble it takes to standardize authentication, a piecemeal approach involving users personal preferences develops. There are no dedicated servers in a peer-to-peer network, and such a network can be created with as few as two computers.

Which of the following is an example of a LAN?

(D. A computer connected to another computer so they can share resources) LANs generally have a geographic scope of single building or smaller. They can range from simple (two hosts) to complex (with thousands of hosts)

What advantage does the client-server architecture have over peer-to-peer?

(D. All of the above..."Easier maintenance" "Greater organization" "Tighter security" In client-server networks, requests for resources go to a main server that responds by handling security and directing the client to the resource it wants instead of the request going directly to the machine with the desired resource (as in peer-to-peer)

Which of the following physical topologies has the most connections and is the least popular for LANs?

(D. Mesh) Only a mesh physical topology has point-to-point connections to every device, so it has more connections and is not a popular LAN technology

What network model draws a clear distinction between devices that share their resources and devices that do not?

Client-server