Exam Cram Quiz Ch. 1 Flashcards
You have been asked to install a network that will give the network user the greatest amount of fault tolerance. Which topology would you choose? A. Star B. Ring C. Mesh D. Bus
C. Mesh
A mesh network uses a point to point connection to every device on the network. This creates multiple points for the data to be transmitted around the network and therefore creates a high degree of redundancy.
Which of the following topologies allows for network expansion with the least amount of disruption for the current network users? A. Bus B. Ring C. LAN D. Star
D. Star
On a star network, each network device uses a separate cable to make a point to point connection to a centralized device, such as a hub or a switch.
Which network topology offers the greatest level of redundancy but has the highest implementation of cost? A. Wireless mesh B. Wired Mesh C. Hybrid Star D. Bus Network
B. Wired Mesh
The wired mesh topology requires each computer on the network to be individually connected to every other device. This configuration provides maximum reliability and redundancy for the network.
Which of the following statements are associated with a bus LAN network? Choose all correct answers.
A. A single cable break can cause complete network disruption.
B. All devices connect to a central device.
C. It uses a single backbone to connect all network devices.
D. It uses a dual-ring configuration
A. A single cable break can cause complete network disruption.
C. It uses a single backbone to connect all network devices
In a bus network, a single break in the network cable can disrupt all the devices on that segment of the network. A bus network also uses a single cable as a backbone to which all networking devices attach.
As a network administrator, you are called in to troubleshoot a problem on a token ring network. The network uses two MSAUs connected using the ring in ports on both devices. All network cards are set at the same speed. What is the likely cause of the problem? A. Bad network card B. Faulty cabling C. MSAU configuration D. Network card configuration.
C. MSAU Configuration
To create the complete ring, the ring-in port on each MSAU is connected to the Ring out port on another MSAU.
Which topology would utilize a switch? A. Bus B. Mesh C. Star D. Ring
A. Star
With which topology does every node have a direct connection to every other node? A. Bus B. Mesh C. Star D. Ring
B. Mesh
True or false: The biggest difference between a LAN and a WAN is usually the size of the network.
True.
A WAN is a network that spans more than one geographic location, often connecting separated LANs.
What network type is essentially a LAN created to share data among devices associated with you?
A personal-area network (PAN) is essentially a LAN created to share data among devices associated with you.
In what networking type is consolidated, block-level data storage made available to networked devices?
A storage-area network (SAN) makes block-level data storage available to devices on the network.
When a WAN is confined to a certain geographic area, such as a city, it is known as a: A. LAN B. MAN C. VAN D. VPN
B. MAN
A WAN can be referred to as a metropolitan-area network when it is confined to a certain geographic area, such as a city.
Which of the following is a computer network in a defined area that links buildings and consists of multiple LANs within that limited geographical area? A. SAN B. PAN C. DAN D. CAN
D. CAN (Campus area network)
A campus area network is a computer network in a defined area that links buildings and consists of multiple LANs within that limited geographical area.
Which of the following provides a flexible and secure data communication system that augments an Ethernet LAN or, in some cases, replaces it altogether? A. PHLAN B. MAN C. WLAN D. CRAN
C. WLAN (Wireless Local Area Network)
A wireless LAN augments an Ethernet LAN or in some cases, replaces it altogether.
What is the access method employed by the 802.11 wireless standards?
All the 802.11 wireless standards employ the CSMA/CA access method.
What technologies are considered the biggest developments for 802.11n/802.11ac and the keys to the newer speeds?
Multiple input, multiple output and multiuser antenna technologies are the biggest developments for 802.11n/802.11ac and the key to the new speeds.
You are installing a wireless network solution, and you require a standard that can operate using either 2.4 GHz or 5GHz frequencies. Which of the following standards would you choose? A. 802.11a B. 802.11b C. 802.11g D. 802.11n E. 802.11ac
D. 802.11n
- 11n can use either the 2.4 GHz or 5 GHz
- 11ac uses 5 GHz
- 11b/802.11g use 2.4 GHz
You are installing a wireless network solution that uses a feature known as MU-MIMO. Which wireless networking standard are you using? A. 802.11a B. 802.11b C. 802.11n D.802.11ac
D. 802.11ac
802.11n introduced MIMO and 802.11ac uses MU-MIMO which is multiuser multiple input/multiple output
Bus Topology
Connects computers on the network via a backbone
Connect to the backbone using T connectors or taps
Each end of the physical bus must be terminated with one end grounded.
Bus Advantages
Cheap compared to other topologies, easy to implement, requires less cable, does not use specialized network equipment
Bus Disadvantages
Network disruption might occur when computers are added or removed, a break in the cable prevents all systems from accessing the network, difficult to troubleshoot
Ring Topology
A logical ring - the data travels in a circular fashion from one computer to another on the network.
If a single computer or section of cable fails the signal is interrupted. Network disruption can also occur when computers are added or removed.
How do you give a ring topology a fault tolerant design?
Ring topology can be setup in a fault tolerant design meaning they can have a primary ring and a secondary ring so if one ring fails data can use the alternate ring to reach its destination
Ring Topology MSAU Configuration
The ring topology uses a multistation access unit (MSAU) that act like a hub/switch. The MSAU performs the token circulation internally; to complete the ring the ring in port on each MSAU is connected to the ring out port on another MSAU.
Ring Topology Advantages
Cable faults are easily located for easy troubleshooting, moderately easy to install
Ring Topology Disadvantages
Expansion to the network can cause network disruption, a single break in the cable can disrupt the entire network.
Star Topology
All computers and network devices connect to a central device called a hub or switch. Point to point connection between the device and hub/switch is required to connect the device to the network. Easiest to expand in terms of number of devices and expansion does not cause network disruption
Star Topology Advantages
Easily expandable w/o network disruption, cable failure only affects a single user, easy to troubleshoot and implement
Star Topology Disadvantages
Requires more cable than most other topologies, a central connection devices allows a single point of failure, requires additional networking equipment
Wired Mesh Topology
Each computer on the network connects to every other device creating a point to point connection between every device on the network.
High level of redundancy b/c if one cable fails there is an alternate path b/c each node (device on the network) acts as a relay
Hybrid Wired Mesh Topology
Creates a point to point connection between specific devices only like servers. Anything that is not a full wired mesh topology is a partial wired mesh topology
Wired Mesh Topology Advantages
Provides redundant paths between LAN topologies, network expansion w/o disruption
Wired Mesh Topology Disadvantages
Requires more cable than the other topologies, complicated implementation, challenging to troubleshoot
Infrastructure Wireless Topology
Managed wireless topology
Used to extend a wired LAN to include wireless devices
WAP need for wireless devices to communicate with wired LAN
Adhoc Wireless Topology
Unmanaged wireless topology
Peer to peer network design used to connect a small number of devices.
Devices communicate directly among themselves w/o an AP.
Quick way to share files and resources
Wireless Mesh Topology
Each network node is interconnected to other nodes on the network
Created by connecting WAPs installed at each network users locale.
Each additional node provides new paths for other nodes which in turn improves network performance and decreases congestion
Self healing, easily accessible, very reliable but very expensive
LANs
data network restricted to a single geographic location and typically encompasses a relatively small area
WLANs
Wireless local area network provides a flexible and secure data communications system that augments an Ethernet LAN or in some cases replaces it altogether.
WANs
Wide area network that spans more than one geographic location and often connects separated LANs.
MANs
Metropolitan area network - a WAN confined to a certain geographic area. Smaller than WAN but bigger than LAN.
CANs
Campus area network is a computer network in a defined area that links buildings and consists of multiple LANs within that limited geographical area.
SANs
Storage area network consists of networked/shared storage devices.
Are subsets of LANs and offer block level data storage that appears within the OS of the connected devices as locally attached devices.
PANs
Personal area network is a LAN created to share data among devices associated with you. WPAN is a wireless PAN using Bluetooth , infrared or near field communication
Z - Wave
Communication protocol focused on the office/residential/automation market.
Requires a central control devices the Z-wave gateway that acts as both the hub controller and the portal.
Z-wave network can have up to 232 devices connected and each device must be paired to be recognized by the controller.
What is the home ID on a Z Wave network?
Network identifier consisting of a 32 bit Network ID. Each device on the network is identified through a 8 bit node ID.
Ant+
A wireless protocol used to control lighting systems, television sets, and other indoor entities governed by Garmin
Operates in the 2.4 GHz range
Bluetooth
Transmits on the 2.4-2.485 GHz band
79 available Bluetooth channels w/ a bandwidth of 1 MHz
Packet based protocol w/ a master-slave structure. One master can communicate with up to 7 slaves
NFC
Near field communication requires a user to bring the client close to a WAP in order to verify through Radio Frequency Identification (RFID) or WIFI that the device is present
IR
Infrared requires a direct line of sight and restrictive distance limitations.
IR Wireless Networking uses infrared beams to send data transmissions between devices.
High Transmission rates ranging 10-16 Mbps
RFID
Radio Frequency Identification allows compatible hardware both to supply power to and communicate with an otherwise unpowered and passive electronic tag.
Readers work with 13.56 MHz smart cards and 125 KHz proximity cards
802.11a
Transmission speeds up to 54 Mbps 5 GHz RF range Uses OFDM Orthogonal Frequency Division Multiplexing transmission strategy Common speeds 6, 12, or 24 Mbps Not compatible w/ 802.11b and 802.11g
802.11b
Transmission speed up to 11 Mbps
2.4 GHz RF range
DSSS Direct Sequence Spread Spectrum transmission strategy
Compatible w/ 802.11g
802.11g
Transmission speeds up to 54 Mbps
2.4 GHz range
DSSS Direct Sequence Spread Spectrum transmission strategy
Compatible w/ 802.11b
802.11n
Theoretical transmission speed up to 600 Mbps
2.4 GHz and 5 GHz RF range
Uses OFDM Orthogonal Frequency Division Multiplexing transmission strategy
Introduced MIMO the ability to coordinate multiple simultaneous radio signals
Enabled channel bonding that doubled the data rate supporting 20 and 40 MHZ channels
802.11ac
Transmission speeds 500 Mbps with one link and 1.3 Gbps w/ multiple links
5 GHz RF range
Uses OFDM Orthogonal Frequency Division Multiplexing transmission strategy
Supports up to 8 MIMO streams and increased channel bonding
Supports up to 4 muliuser MIMO clients (MU-MIMO)
Supports 20, 40, 80, and 160 Mhz channels
Multiplexing
Combines multiple signals for transmission over a single line or medium.
MIMO
Multiple Input/Multiple Output uses multiplexing to increase range and speed of wireless networking. MIMO enables the transmission of multiple data streams traveling on different antennas in the same channel at the same time.
OFDM
Orthogonal Frequency Division Multiplexing transmission strategy is used as a digital multicarrier modulation method in which a large number of closely spaced orthogonal subcarrier signals are used to carry data on several parallel data streams or channels.
A single channel is 20 MHz in width. Two bonded channels are 40 MHz in width.
