Podcast
Questions and Answers
Which of the following is a characteristic of wide area networks?
Which of the following is a characteristic of wide area networks?
- They have minimal costs associated with their use.
- They are only used for voice communications.
- They operate primarily on a local telephone network.
- They can suffer from high data error rates. (correct)
What is one of the primary functions of a wide area network (WAN)?
What is one of the primary functions of a wide area network (WAN)?
- To facilitate voice and data communications across large distances. (correct)
- To connect different local area networks (LANs) within a building.
- To ensure high-speed internet access for all organizational members.
- To provide unlimited long-distance phone service to all users.
What does Direct Distance Dialing (DDD) primarily provide?
What does Direct Distance Dialing (DDD) primarily provide?
- Unlimited data transfer across a private network.
- Local network connections between two offices.
- High-speed data transmission exclusively.
- Voice and data communication over the public telephone network. (correct)
What is an example of a vendor that provides hardware for WANs?
What is an example of a vendor that provides hardware for WANs?
What is typically true about the speed of data transmission in WANs?
What is typically true about the speed of data transmission in WANs?
What type of topology does the original Ethernet design utilize?
What type of topology does the original Ethernet design utilize?
What was the main reason General Motors opted for a deterministic token bus LAN design?
What was the main reason General Motors opted for a deterministic token bus LAN design?
Which protocol is central to the Manufacturing Automation Protocol (MAP)?
Which protocol is central to the Manufacturing Automation Protocol (MAP)?
What is a common application of Wi-Fi LANs mentioned in the content?
What is a common application of Wi-Fi LANs mentioned in the content?
In what type of environments is the token ring topology particularly utilized?
In what type of environments is the token ring topology particularly utilized?
Which technology is suggested as a potential basis for wide-area wireless networks?
Which technology is suggested as a potential basis for wide-area wireless networks?
What aspect of the assembly line influenced the design decision for the LAN used in manufacturing?
What aspect of the assembly line influenced the design decision for the LAN used in manufacturing?
What is a distinguishing feature of wireless LANs mentioned in the context provided?
What is a distinguishing feature of wireless LANs mentioned in the context provided?
What is the typical transmission speed range for coaxial cable?
What is the typical transmission speed range for coaxial cable?
Which of the following best describes the main advantage of broadband coax over baseband coax?
Which of the following best describes the main advantage of broadband coax over baseband coax?
What is the typical speed range for twisted pair cables used for LAN applications?
What is the typical speed range for twisted pair cables used for LAN applications?
What material typically covers the cylindrical conductor in coaxial cable?
What material typically covers the cylindrical conductor in coaxial cable?
Which of the following transmission mediums has the slowest typical speed range?
Which of the following transmission mediums has the slowest typical speed range?
What is the main frequency band used by the 802.11a standard?
What is the main frequency band used by the 802.11a standard?
Which Wi-Fi standard is known for having the greatest range?
Which Wi-Fi standard is known for having the greatest range?
Broadband coax has largely replaced which type of transmission medium in certain applications?
Broadband coax has largely replaced which type of transmission medium in certain applications?
What is the maximum data rate achievable by the 802.11n standard?
What is the maximum data rate achievable by the 802.11n standard?
What is a key feature of broadband coax compared to baseband coax?
What is a key feature of broadband coax compared to baseband coax?
How does the range of the 802.11b standard compare to that of the 802.11a standard?
How does the range of the 802.11b standard compare to that of the 802.11a standard?
Which of the following is NOT typically a characteristic of baseband coax?
Which of the following is NOT typically a characteristic of baseband coax?
What technology does Fast Ethernet use to achieve its speed?
What technology does Fast Ethernet use to achieve its speed?
In which frequency bands does the 802.11n standard operate?
In which frequency bands does the 802.11n standard operate?
What is the typical data rate range for the 802.11b standard?
What is the typical data rate range for the 802.11b standard?
Which of the following statements about 802.16e is correct?
Which of the following statements about 802.16e is correct?
What is a primary advantage of fiber-optic technology over other transmission mediums?
What is a primary advantage of fiber-optic technology over other transmission mediums?
What is used to enable dense wave division multiplexing in fiber optics?
What is used to enable dense wave division multiplexing in fiber optics?
What type of light source is commonly used in fiber-optic systems?
What type of light source is commonly used in fiber-optic systems?
What is the approximate outside diameter of single-mode fiber-optic cable?
What is the approximate outside diameter of single-mode fiber-optic cable?
Which of the following statements is true about the security of fiber optics?
Which of the following statements is true about the security of fiber optics?
What is one of the components required for an optical transmission system?
What is one of the components required for an optical transmission system?
How does fiber optics compare in size to typical coaxial cables?
How does fiber optics compare in size to typical coaxial cables?
What telecommunication technologies competed with fiber optics before the technology was fully deployed?
What telecommunication technologies competed with fiber optics before the technology was fully deployed?
Study Notes
Coaxial Cable
- Baseb'and coax is commonly used for LANs and long-distance transmissions in the telephone network
- Baseband coax consists of a central wire surrounded by an insulator, a braided mesh cylinder, and an outer protective plastic covering
- Broadband coax is the standard cable for television signals and uses digital transmission
- A single broadband coax can be divided into multiple channels for simultaneous transmission of data, voice, and television
- Broadband coax has a wider capacity than baseband coax, making it more durable
- Broadband coax continues to be used for cable television and LANs
Fiber-Optic Cabling
- Fiber-optic cabling is a true medium, not a broadcast technology
- Data is transmitted through pulses of light using fiber-optic cable
- Key components include a light source (LED or laser diode), fiber-optic cable, and a detector (photodiode)
- Fiber-optic cables are significantly faster than other media and require less space due to their small diameter
- Compared to coaxial cables, single-mode fiber-optic cables have a smaller outside diameter and support higher transmission speeds (up to 800 gbps)
Telecommunications Transmission Speeds
- Transmission speeds vary depending on the medium
- Twisted pair for voice telephones typically range from 14.4 kbps to 56 kbps
- Twisted pair for digital telephones typically range from 128 kbps to 24 mbps
- Twisted pair in LANs typically range from 10 mbps to 100 gbps
- Coaxial cable typically range from 10 mbps to 150 mbps
- Wireless LAN typically range from 6 mbps to 600 mbps
- Microwave typically range from 256 kbps to 1 gbps
- Satellite typically range from 256 kbps to 1 gbps
Network Topologies
- All telecommunications networks employ one or more of the transmission media discussed
- Shared Ethernet uses a contention bus as its logical topology
Wireless LAN
- Wi-Fi LAN are becoming increasingly popular
- Wi-Fi is ideal for mobile users, offering access in airports, restaurants, hotels, university campuses, and homes
- The 802.11a Wi-Fi standard operates in the 5 GHz band with data rates up to 54 mbps but has a limited range of 150 feet
- The 802.11b standard operates in the 2.4 GHz band with data rates of 5.5 to 11 mbps and a range of 300 to 500 feet
- The 802.11g standard uses multiplexing in the 2.4 GHz band to achieve data rates up to 54 mbps with a range of 300 to 500 feet
- The 802.11n standard uses both 2.4 GHz and 5 GHz frequency ranges, achieving data rates up to 300 mbps and a range of up to 1,000 feet
Higher-Speed Wired Local Area Networks
- Traditional Ethernet has a top speed of 10 mbps
- Fast Ethernet operates at 100 mbps and is the most prevalent form of Ethernet in new LANs
- Fast Ethernet uses the same CSMA/CD architecture and wiring as traditional Ethernet
- Fast Ethernet is implemented with 100 Base-T for twisted-pair cabling (Category 5) and 100 Base-F for multimode fiber-optic cable
Wide Area Networks
- WANs (Wide Area Networks) are called long-haul networks and are used for communication between geographically dispersed entities
- WANs rely on the public telephone network
- Direct Distance Dialing (DDD) offers voice and data communication between any two points served by the telephone network but has limited speeds, high data error rates and high cost
- Wide Area Telephone Service (WATS) provides unlimited long-distance telephone service but uses traditional voice circuits
- SONET circuits offer varying data transmission rates depending on the SONET level.
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