1. Introduction to Networks Flashcards
- You need a network that provides authentication for your users. Which of the following logical topologies should you use?
a. VLANs
b. Peer to peer
c. Client-server
d. Mesh
c. A client-server logical topology allows you to have a centralised 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?
a. Bus
b. Ring
c. Star
d. Mesh
c. 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?
a. Bus
b. Star
c. Ring
d. Mesh
d. 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?
a. The ring is broken, so no other devices can communicate.
b. Only that workstation loses its ability to communicate.
c. That workstation and the device it’s connected to lose communication with the rest of the network.
d. No devices can communicate because there are now two unterminated network segments.
b. 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?
a. VPN
b. T1
c. MPLS
d. LAN
e. Bus
c. Multi-Protocol Label Switching has 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?
a. WAN
b. LAN
c. MPLS
d. Host
b. 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?
a. Where to place the server
b. Whose computer is least busy and can act as a server
c. The security associated with such a network
d. Having enough peers to support creating such a network
c. It is easy to relax about security in a peer to peer environment. Because of the trouble it takes to standardise 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?
a. When a centralised office needs to communicate with many branch offices
b. When a full mesh of WAN links is in place
c. When multiple offices are daisy-chained to one another in a line
d. When there are only two nodes in the network to be connected
a. 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 an example of a LAN?
a. Ten buildings connected Ethernet connections over fiber-optic cabling
b. Ten routers interconnected by frame-relay circuits
c. Two routers connected by a T1 circuit
d. A computer connected to another computer and they can share resources
d. 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).
10, Which of the following is a disadvantage of the star topology?
a. When a single port on the central concentrating device fails, the entire network loses connectivity.
b. When the central connecting device experiences a complete failure, all attached devices lose connectivity to the rest of the network.
c. In a star topology, a more expensive type of host must be used compared to the host used when implementing a physical bus.
d. It is more difficult to add stations and troubleshoot than the other topologies.
b. 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.
- What is a difference between a LAN and a WAN?
a. WANs require a router.
b. WANs cover larger geographical areas.
c. WANs can utilise either private or public data transport.
d. All of the above.
d. 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
- Which of the following provides the most physical layout flexibility in a very large, geographically dispersed enterprise network?
a. Bus topology
b. LAN switch
c. Star topology
d. MPLS cloud network
d. Multiprotocol Label Switching provides logical links between sites, so branch offices can be easily and quickly added.
- In what type of network are all computers considered equal and do not share any central authority?
a. Peer-to-peer
b. Client-server
c. Physical topology
d. None of the above.
a. 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 advantage does the client-server architecture have over peer-to-peer?
a. Easier maintenance
b. Greater organisation
c. Tighter security
d. All of the above
d. In client-server networks, requests for resources go to a main server that responds by handling security and directing the client to the resources it wants instead of the request going directly to the machine with the desired resource (as in peer-to-peer).
- Which of the following is an example of a hybrid network?
a. Ethernet switch
b. Ring topology
c. Bus topology
d. Star topology
a. The best answer to this question is an ethernet switch, which uses a star physical topology with a logical bus technology.
