Network+ Chapter 1

What device is an example of an Ethernet technology implemented as a star topology?

Hub

You need a network that provides centralized authentication for your users. Which of the following logical topologies should you use? VLANs Peer‐to‐peer Client/Server Mesh

A client/server logical topology allows you to have a centralized database of users so that authentication is provided in one place.

Which network topology is a combination of two or more types of physical or two or more types of logical topologies? Point‐to‐multipoint Hybrid Bus Star

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

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

A segment

What advantage does the client‐server architecture have over peer‐to‐peer? Easier maintenance Greater organization Tighter security All of the above

All of the above 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).

What is a difference between a LAN and a WAN? WANs need a special type of router port. WANs cover larger geographical areas. WANs can utilize either private or public data transport. All of the above.

All of the above. A typical WAN connects two or more remote LANs together using someone else's network (your ISP's) using a router. Your local host and router see these networks as remote networks and not as local networks or local resources.

When designing a network and deciding which type of network topology to use, which item(s) should be considered? (Select all that apply.) Cost Ease of installation Ease of maintenance Fault‐tolerance requirements

All. Each topology has its own set of pros and cons regarding implementation, so asking the right questions and considering cost, ease of installation, maintenance, and fault tolerance are all important factors to be considered.

What type of topology gives you a direct connection between two routers so that there is one communication path? Point‐to‐point Star Bus Straight

As its name implies, in a point‐to‐point 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 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 are the three primary LAN topologies?

Bus, ring, and star

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

Client/server

You have a network with multiple devices and need to have a smaller broadcast domain while working with a tight budget. Which of the following is the best solution? Use static IP addresses Add more hubs Implement more switches Create VLANs

If you have a switch, you can break up a layer‐2 switched networks into smaller broadcast domains by creating VLAN's.

In what type of network are all computers considered equals and do they not share any central authority? Peer‐to‐peer Client‐server Physical topology None of the above

In a peer‐to‐peer network, all computers are considered equals. It is up to the computer that has the resource being requested to perform a security check for access rights to its resources.

In a physical‐star topology, what happens when a workstation loses its physical connection to another device? The ring is broken, so no devices can communicate. Only that workstation loses its ability to communicate. That workstation and the device it's connected to lose communication with the rest of the network. No devices can communicate because there are now two unterminated network segments.

In a star topology, each workstation connects to a hub, switch, or similar central device, but not to other workstations. The benefit is when connectivity to the central device is lost, the rest of the network lives on.

Which type of topology has the greatest number of physical connections? Point‐to‐multipoint Star Point‐to‐point Mesh

In the mesh topology, there is a path from every machine 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.

Which of the following is an example of a LAN? Ten buildings interconnected by Ethernet connections over fiber‐optic cabling Ten routers interconnected by frame‐relay circuits Two routers interconnected with a T1 circuit A computer connected to another computer so they can share resources

LANs generally have a geographic scope of a single building or smaller. They can range from simple (two hosts) to complex (with thousands of hosts).

What common WAN topology often results in multiple connections to a single site, leading to a high degree of fault tolerance?

Mesh

Which of the following physical topologies has the least likelihood of having a collision? Bus Start Ring Mesh

Only a Mesh physical topology has point‐to‐point connections to every device, so it has the least likelihood of ever having a collision.

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

Point‐to‐point

Which of the following is a concern when using peer‐to‐peer networks? Where to place the server Whose computer is least busy and can act as the server The security associated with such a network Having enough peers to support creating such a network

Security is easy to relax 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.

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

Server

An example of a hybrid network is which of the following? Ethernet Ring topology Bus topology Star topology

The best answer to this question is Ethernet, which uses a start physical topology with a logical bus technology

You want to remotely log into an office computer using remote desktop in a secure manner. Which of the following should you use? VPN Tagged packets VLANs Telnet SSH

To connect to remote office securely, you need to use a Virtual Private Network (VPN).

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

To install a physical topology that provides ease of scalability use a star network. This is a hub or switch device, and this is the most common LAN networks today.

What is a logical grouping of network users and resources connected to administratively defined ports on a switch? Host Hub VLAN VTP

VLANs allow you to be anywhere on the physical network and still be local to the network resources you need.

What does VLAN stand for?

Virtual local area network (LAN)

What does VPN stand for?

Virtual private network

What does the acronym VPN stand for? Virtual processor network Virtual passive network Virtual private network Variable‐length private network

Virtual private networks (VPNs) allow for the creation of private networks across the Internet. A VPN makes your local host part of the remote network by using the WAN link that connects you to the remote LAN.

Which of the following is an example of when a point‐to‐multipoint network is called for? When a centralized office needs to communicate with many branch offices When a full mesh of WAN links is in place When multiple offices are daisy‐chained to one another in a line When there are only two nodes in the network to be connected

When a central office, such as a 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 of the following is a disadvantage of the star topology? When a port on the central concentrating device fails, the attached end device loses connectivity to the rest of the network. When the central concentrating device experiences a complete failure, all attached devices lose connectivity to the rest of the network. In a star topology, a more expensive type of host must be used when compared to the host used when implementing a physical bus. It is more difficult to add stations and troubleshoot than with other topologies

When the central concentrating device experiences a complete failure, all attached devices lose connectivity to the rest of the network. However, this topology makes troubleshooting easier; if the entire network fails, you know where to look first. The central device also ensures that the loss of a 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.