Network+ Study Guide-01 Introduction to Networks

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

Answer explanation

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?

• Bus

• Ring

• Star

• Mesh

Answer explanation

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 network today.

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

• Bus

• Star

• Ring

• Mesh

Answer explanation

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.

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.

Answer explanation

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

• VPN

• T1

• MPLS

• LAN

• Bus

Answer explanation

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 a logical grouping of network users and resources called?

• WAN

• LAN

• MPLS

• Host

Answer explanation

A logical grouping of hosts is called a LAN, and you typically group them by connecting

them to a hub or switch.

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

Answer explanation

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 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

Answer explanation

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 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

Answer explanation

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).

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

• When a single port on the central concentrating device fails, the entire network loses

  connectivity.

• 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 compared to the host

  used when implementing a physical bus.

• It is more difficult to add stations and troubleshoot than with other topologies.

Answer explanation

The only disadvantage mentioned is the fact that there is a single point of failure in 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.