NETWORKPLUS QUESTIONS AND ANSWERS
What does WAN stand for?
Wide area network
A crossover uses which pins to make a connection?
1 to 3 and 2 to 6
568A uses which pins to make a connection?
1,2,3, and 6
Which of the following provides the longest cable run distance? A Single-mode Fiber B Multimode fiber C Category 3 UTP D Coax
A Single-mode fiber allows for the maximum cable run distances.
How is a T1 crossover cable wired? A Pins 1,2,4 and 5 are connected to 4, 5, 1, and 2. B Pins 2, 3,4, and 5 are connected to 4, 5,1, and 2. C Pins 1, 2,4, and 5 are connected to 3,4,5, and 6 D Pins 4, 5, 6 and 7 are connected to 4, ,5,1, and 2.
A T1 cable uses T568B pairs 1 and 2, so to connect two T1 CSU/DSU devices back to back requires a crossover cable that swaps these pairs. Specifically, pins 1,2,4 and 5 are connected to 4,5,1, and 2, respectively.
Will a computer that shares no resources most likely be connected to the backbone or to a segment?
A segment
When designing a network and deciding which type of network topology to use which items should be considered? (Select all that apply.). A Cost B Ease of installation C Ease of maintenance D Fault tolerance requirements
A, B, C, D. 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.
What type of topology gives you a direct connection between two routers so that there is one communication path? A Point-to-point B Star C Bus D Straight
As its name implies, in a point-to-point topology you have 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.
On which type of cable does EMI have the least effect? A Coax B Fiber-optic C UTP D STP
B Fiber optic cable transmits only light (not electricity like UTP), so EMI has zero effect on it.
What type of cable transmits lights from end to end? A Coax B Fiber-optic C UTP D Category 2
B Remember that fiber-optic cable transmits a digital signal using light impulses. Light is carried on either a glass or a plastic core.
What is the main difference between single-mode fiber (SMF) and multimode fiber (MMF)? A Electrical signals B Number of light rays C Number of digital signals D Signal-mode can be run a shorter distance
B The difference between single-mode fibers and multimode fibers is in the number of light rays ( and thus
What type of cable should be used if you need to make a cable run longer than 100 meters? A Category 5e B Category 6 C Fiber optic D Coaxial
B The difference between single-mode fibers and multimode fibers is in the number of light rays (and thus the number of signals) they can carry. Generally speaking, multimode fiber is used for shorter-distance applications and single-mode fiber for longer distances.
You need to crimp on a connector using an RJ-45 connector. Which pin-out configuration would you use to connect a host into a switch? A UTP B Straight-through B Crossover D Rolled
B You would use a straight-through cable to connect a host to a switch, and the typical pin-out is called 568A
Why would a network administrator use plenum-rated cable during an installation? (Choose two.) A Low combustion temperature B High combustion C Reduces toxic gas released during a fire D Is not susceptible to any interference
B, C. Plenum-rated means that the cable's coating doesn't begin burning until a much higher temperature of heat, doesn't release as many toxic fumes as PVC when it does burn, and is rated for use in air plenums that carry breathable air, usually as nonenclosed fresh-air return pathways that share space with cabling.
Which of the following are fiber-optic connectors? (Select three.) A BNC B ST C RJ-11 D SC E LC F RJ-45
B, D, E. There are many different types of fiber-optic connectors. SC, ST, LC, and MT-RJ are some the more typical connectors in use today.
You need to make a 568B cable for a Fast Ethernet link. How many pairs will you use? A 1 B 2 C 3 D 4
B. A 568B is an RJ-45 wiring standard and this type of cable uses two pairs of wires.
Which network topology is a combination of two or more types of physical or two or more types of logical topologies? A Point-to-multipoint B Hybrid C Bus D Star
B. 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? A WAN B LAN C MPLS D Host
B. A logical grouping of hosts is called a LAN, and typically group them by connecting them to a hub or switch.
How many wires are used in a 100Mbps UTP transmission? A 2 B 4 C 6 D 8
B. Both wiring standards for UTP (568A and 568B) utitlize only pins 1, 2, 3 and 6.
In a physical star topology what happens when a workstation loses its physical connection to another device? A The ring is broken, so no devices can communicate B Only that workstation loses its ability to communicate C That workstation and the device its connected to lose communication with the rest of the network. D No devices can communicate because there are now two unterminated network segements.
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 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 concentrating device experinces 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 with 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 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.
You need to connect two devices on a network and they need to send voice traffic. Which of the following cable will you use? A Cat 3 Cat 5 C Cat 8 D Rolled
B. To connect two devices for voice on a vertical connect, the minimum cable you can use is Category 5E.
Which LAN topology is characterized by all devices being daisy-chained together with the devices at each end being connected to only one device?
Bus
What are the three basic LAN topologies?
Bus, ring, and star
You need a network that provides centralized 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 centralized database of users so that authentication is provided in one place.
Fiber-optic cable is immune to electromagnetic interference (EMI) and radio frequency interference (RFI) because it ______. A Transmits analog signals using electricity B Transmits analog signals using light impulses D Transmits digital signals using electricity
C Fiber-optic cable transmits digital signals using light impulses rather than electricity; therefore, it is immune to EMI and RFI.
What type of connector does UTP cable typically use? A BNC B ST C RJ-45 D SC
C UTP usually connects with RJ-45. You can use a crimper to attach an RJ connector to a cable.
How many devices can be connected to a full-duplex segment? A 0 B 1 C 2 D 4
C. Full-duplex communication requires a point-to-point configuration because the collision-avoidance circuit is disabled.
Which of the following is a concern when using peer-to-peer networks? A Where to place the server B Whose computers is least busy and can act as the 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 standardize authentication, a piecemeal approach involving user's 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 type fo WAN technology uses labels, which enables priority of voice through the network? A VPN B T1 C MPLS D LAN E Bus
C. Multiprotocol Label switching has as many advantages as a LAN protocol. When labels are used, voice can have priority over basic data, for example.
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 UTP uses four twisted wire pairs (eight wires), is rated for 100MHz, and is capable of handling the disturbance on each pair caused by transmitting on all four pairs at the same time?
Category 5e
Which UTP wiring uses four twisted pairs (eight wires) and is rated for 250MHz?
Category 6
What network model draws a clear distinction between devices that share their resources and devices that do not?
Client-server
What is the term for a device that shares its resources with other network devices?
Server
Which type of cable will you use to connect two switches to each other?
Crossover
Which of the following Ethernet unshielded twisted-pair cabling types are commonly used? A 10BaseT B 100BaseTX C 1000BaseTX D All of the above
D UTP is commonly used in twisted-pair Ethernet like 10BaseT, 100BaseTX, 1000BaseTX, and so on.
What is a difference between a LAN and a WAN? A WANs require a router B WANs cover larger geographical areas C WANs can utilize 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.
A crossover cable is used to connect all of the following except _______. A Switch to switch B Host to host C Hub to switch D Host to switch
D. All devices that are pinned the same for transmit and receive require a crossover cable to communicate directly.
What advantage does the client-server architecture have over peer-to-peer? a Easier maintenance B Greater organization C Tighter security D All of the above
D. In client-serer 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 type of topology has the greatest number of physical connections? A Point-to-multipoint B Star C Point-to-point D Mesh
D. In the mesh toplogy, 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.
Which of the following is an example of a LAN? A Ten building interconnected by Ethernet connections over fiber-optic cabling B Ten routers interconnected by Frame Relay circuits C Two routers interconnected with a T1 circuit D A computer connected to another computer so 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).
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.
Which of the following physical topologies has the most connections and is the least popular for LANs? A Bus B Start 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.
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? A Use static IP addresses B Add more hubs C Implement more switches D Install a router
D. Routers are used to connect different networks together.
The purpose of the demarcation point is to separate the customer from whom? A The branch office B Headquarters C The data center D The service provider
D. The demarcation point, or demark, is the point at which the operational control or ownership changes from your company to a service provider. This is often at the MDF in relation to telephone connections and the CSU/DSU in regard to WAN connections.
In which of the following categories is UTP cable not rated? A Category 2 B Category 3 C Category 5e D Category 8
D. Unshielded twisted-pair has standards from Category 2 through 6 for use on Ethernet networks. There is no Category 8 defined.
The point at which the operational control or ownership changes from your company to a service provider is referred to as ________.
Demarcation point, or demarc
What device is generally implemented as a star topology?
Hub or switch
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
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.
How many hosts on a half-duplex segment can talk at one time? A 0 B 1 C 2 D Unlimited
In half-duplex communication, a device can either send communication or receive communication, but it cannot do both at the same time.
What are two advantages of fiber optic cabling?
It is completely immune to EMI and RFI and can transmit up to 40 kilometers (about 25 miles).
What does MPLS stand for?
Multiprotocol Label switching
What common WAN topology often results in multiple connections to a single site (leading to a high degree of fault tolerance) and has one-to-many connections?
Multiprotocol Label switching (MPLS)
Which network topology or connection type can be implemented with only two endpoints?
Point-to-Point
Which RG rating of coax is used for cable modems?
RG-6
You want to connect a host to a switch port. What type of Ethernet cable will you use?
Straight-through
Which of the following is an example of a hybrid network? A Ethernet switch B Ring topology C Bus topology D Star topology
The best answer to this question is an Ethernet switch, which uses a star physical topology with a logical bus technology.
In what instance would you use T1 crossover cable?
To connect two CSU/DSUs
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 B When a full mesh of WAN links is in place C When multiple offices are daisy-chained to one another in line D When there are only two nodes in the network to be connected
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.