Ch. 4 LAN Test

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Questions and Answers

What is the main function of Layer 1, The Physical Layer?

  • Separates signals by frequency
  • Routes messages to the right protocol stack
  • Determines the type and method for sharing the network (correct)
  • Accomplishes switching by using a fast-switching matrix

What type of system is it if modulation-demodulation is used, i.e., if it uses a carrier signal and data modulation/demodulation?

  • Baseband system
  • Switched media system
  • Broadband or carrier-band system (correct)
  • Contention method system

What does broadband refer to in the context of network technology?

  • Using a fast-switching matrix
  • Containing only a single carrier on the bus
  • Separating signals by frequency or time (correct)
  • Having only one digital signal on the bus

What technology offers network services for multiple LANs on one trunk or consists of carrier-supplied services like ISDN and DSL?

<p>Integrated Services Digital Network (ISDN) and variations of Digital Subscriber Line (DSL) (D)</p> Signup and view all the answers

What is the main characteristic of baseband transmission?

<p>Contains only a single carrier on the bus (C)</p> Signup and view all the answers

What is the main characteristic of switched media access schemes?

<p>Uses a fast-switching matrix for switching (D)</p> Signup and view all the answers

What is a common name for industrial networks according to the text?

<p>Data highways (A)</p> Signup and view all the answers

In data communications of the 1970s, what made it a costly venture?

<p>Costly disk storage (B)</p> Signup and view all the answers

What do industrial LANs include according to the text?

<p>Several standards including FOUNDATION Fieldbus, PROFIBUS and PROFINET (D)</p> Signup and view all the answers

According to the preferred definition in the text, when does a company have a LAN?

<p>When it owns the medium of transmission, infrastructure, and three or more devices in communication (C)</p> Signup and view all the answers

What is the IEEE 802 model primarily concerned with?

<p>Variable size packet networks (C)</p> Signup and view all the answers

What was the primary focus of data communications in the 1970s according to the text?

<p>Point-to-point communication (C)</p> Signup and view all the answers

What does the combination of 'smart' devices and electrical connectivity constitute, as per the text?

<p>'Smart' network system (C)</p> Signup and view all the answers

What are some common names for industrial networks as mentioned in the text?

<p>'Smart' devices and fieldbuses (C)</p> Signup and view all the answers

What can be used to form a distributed control system according to the text?

<p>'Smart' devices connected by a local area network (A)</p> Signup and view all the answers

What should one look at first to understand how the IEEE 802 model complements other models?

<p>'Open Systems Interconnect ISO 7498 model (D)</p> Signup and view all the answers

What is the main difference between baseband and broadband?

<p>Baseband systems have a single channel, while broadband systems have multiple channels (B)</p> Signup and view all the answers

What is a characteristic of the star topology?

<p>All linked devices input to the computer and the computer outputs to all linked devices (D)</p> Signup and view all the answers

What is an advantage of the bus topology?

<p>The failure of a node to bypass when it’s inactive is not necessarily devastating to network operations (A)</p> Signup and view all the answers

Which type of transmission media is considered for Ethernet systems?

<p>Copper, fiber optic, and wireless (A)</p> Signup and view all the answers

What is the main difference between the original 802.11 standard and standard 802.11a?

<p>The original 802.11 standard provided for 1 or 2 Mbps transmission, while standard 802.11a provided for higher data speeds (A)</p> Signup and view all the answers

What is a characteristic of the ring topology?

<p>Each device must be active on the ring or there must be some provision for bypassing the device (C)</p> Signup and view all the answers

What does network topology refer to?

<p>The physical layout and the logical connections between intermediary and end devices (D)</p> Signup and view all the answers

Why was twisted-pair telephone wiring investigated by early network designers?

<p>Because it was already installed and could lead to tremendous cost savings if used for networking (D)</p> Signup and view all the answers

What does Ethernet switches essentially function as?

<p>Powerful computers with large numbers of Ethernet network interface cards (B)</p> Signup and view all the answers

What type of topology does most broadband systems use?

<p>Star topology (C)</p> Signup and view all the answers

Which type of cable is considered ideal for ring topology networks?

<p>Fiber optic cable (A)</p> Signup and view all the answers

What does the term 'logical connection' refer to in network systems' architecture?

<p>The way in which the network operating software views the dataflow of a device (B)</p> Signup and view all the answers

What is the function of a repeater in a network?

<p>Regenerates the input signal to extend a particular segment of a network (B)</p> Signup and view all the answers

What is the main function of a hub in a network?

<p>Boosts a degraded signal (D)</p> Signup and view all the answers

What kind of devices do modern bridges typically operate as?

<p>Learning bridges (A)</p> Signup and view all the answers

What is the main difference between a bridge and an Ethernet switch?

<p>Bridge connects two network segments while switch learns MAC addresses (A)</p> Signup and view all the answers

What is the function of a router in a network?

<p>Contains logic that examines Layers 1, 2, and 3 information and connects two or more networks (D)</p> Signup and view all the answers

What is the primary function of a brouter in a network?

<p>Works as a bridge and as a router (C)</p> Signup and view all the answers

What is the main function of gateways in the context of industrial settings?

<p>Performs protocol conversion to allow for data exchange between incompatible networks (D)</p> Signup and view all the answers

What is media access in the context of network operation?

<p>Determining who should speak, who should listen, and under what conditions on the network (A)</p> Signup and view all the answers

What is polling as an access method in networking?

<p>A method for asking one or more secondary nodes if they have any traffic to send (B)</p> Signup and view all the answers

What is an example of a modified method of polling?

<p>Event-driven polling (B)</p> Signup and view all the answers

What is one of the functions mentioned for gateways in Internet terminology?

<p>Making the connection between the local autonomous network and the Internet (A)</p> Signup and view all the answers

What is one function mentioned for gateways in industrial settings?

<p>Performing protocol conversion to allow for data exchange between incompatible networks (C)</p> Signup and view all the answers

Which IEEE 802.11 standard operates in the 60 GHz millimeter wave spectrum?

<p>802.11ad (D)</p> Signup and view all the answers

Which IEEE 802.11 standard allows WLAN operation in the TV white space spectrum in the VHF and UHF bands?

<p>802.11af (D)</p> Signup and view all the answers

Which IEEE 802.11 standard provides a data rate of up to 433.3 Mbps per spatial stream in 80 MHz channels in the 5 GHz band?

<p>802.11ac (D)</p> Signup and view all the answers

Which IEEE 802.11 standard is meant to cover much larger areas than the 802.11 standards?

<p>802.16 WiMAX (D)</p> Signup and view all the answers

What technology is used to operate the IEEE 802.11 standards over moderate distances and provide a bit rate comparable to wired LANs?

<p>Wireless Mesh Networks (A)</p> Signup and view all the answers

Which IEEE 802.11 standard uses the 5 GHz band and provides up to 54 Mbps?

<p>802.11a (A)</p> Signup and view all the answers

Which IEEE 802.11 standard extended the original 802.11 to provide 11 Mbps transmission in the 2.4 GHz band using DSSS?

<p>802.11b (B)</p> Signup and view all the answers

Which IEEE 802.11 standard works in the 2.4 GHz band and has a maximum data rate of 54 Mbps?

<p>802.11b (D)</p> Signup and view all the answers

Which IEEE 802.11 standard uses an orthogonal frequency division multiplexing encoding scheme rather than FHSS or DSSS?

<p>802.11a (B)</p> Signup and view all the answers

Which IEEE 802.11 standard uses multiple antennas technology to make possible spatial multiplexing and other coding schemes?

<p>802.11n (D)</p> Signup and view all the answers

What does IEEE 802.16 WiMAX stand for?

<p>Worldwide Interoperability for Microwave Access (A)</p> Signup and view all the answers

What characterizes Wireless Mesh Networks?

<p>Made up of radio nodes organized into a mesh topology with mesh clients often being laptops, cell phones, and other wireless devices. (B)</p> Signup and view all the answers

What is the maximum distance for 1000BASE-T over copper?

<p>100 m (C)</p> Signup and view all the answers

Which standard was developed for unshielded twisted pair in the 10 GbE?

<p>10GBASE-T (A)</p> Signup and view all the answers

What is the primary responsibility of the MAC layer in IEEE 802 Media Access Control?

<p>Sending and receiving 1s and 0s by arranging them into frames (B)</p> Signup and view all the answers

What is a characteristic of Token Passing Bus networks?

<p>Deterministic operation even at heavy loads (C)</p> Signup and view all the answers

What does 'connectionless' service mean?

<p>Placing addressed packets on the media without establishing a persistent data channel (C)</p> Signup and view all the answers

What are the maximum distances for 1000BASE-SX and 1000BASE-LX?

<p>550 m and 5 km (A)</p> Signup and view all the answers

What is the primary function of the Logical Link Control in IEEE 802.2?

<p>Framing data blocks or packets (B)</p> Signup and view all the answers

What type of cable is required for 1000BASE-CX?

<p>Shielded twisted-pair cable (D)</p> Signup and view all the answers

What is the maximum distance for 1000BASE-T over copper?

<p>100 m (B)</p> Signup and view all the answers

What type of cable is required for 1000BASE-CX?

<p>Shielded twisted-pair cable (B)</p> Signup and view all the answers

What is the maximum distance for 10GbBASE-SR over fiber?

<p>26 m (B)</p> Signup and view all the answers

What was the standard known as for the copper version of the 10 GbE?

<p>10GBASE-T (C)</p> Signup and view all the answers

What is the main function of gateways in the context of industrial settings?

<p>Determining LAN additions, deletions, and security (B)</p> Signup and view all the answers

What characterizes Wireless Mesh Networks according to the text?

<p>Deterministic operation at heavy loads (A)</p> Signup and view all the answers

What is a characteristic of the ring topology according to the text?

<p>Uses token passing as an access method (A)</p> Signup and view all the answers

What does 'connectionless' service mean as per the text?

<p>'Connectionless' service places addressed packets on the media without establishing a persistent data channel (D)</p> Signup and view all the answers

What technology offers network services for multiple LANs on one trunk or consists of carrier-supplied services like ISDN and DSL?

<p>Frame Relay (A)</p> Signup and view all the answers

What is the main characteristic of baseband transmission according to the text?

<p>Modulation-demodulation used, i.e., if it uses a carrier signal and data modulation/demodulation (A)</p> Signup and view all the answers

Which IEEE 802.11 standard uses multiple antennas technology to make possible spatial multiplexing and other coding schemes?

<p>802.11ac (A)</p> Signup and view all the answers

What was the primary focus of data communications in the 1970s according to the text?

<p>Placing and retrieving information without errors on the Physical layer (A)</p> Signup and view all the answers

In an event-driven polling scheme, how does the master station initiate communication with the stations?

<p>By waiting until one of the stations raises an interrupt or signals its intent to transmit (B)</p> Signup and view all the answers

What is the defining characteristic of token passing in a network?

<p>Deterministic access method where each station knows when the token will arrive (B)</p> Signup and view all the answers

What is the minimum length requirement for Ethernet frames at a speed of 10 Mbps to prevent collisions?

<p>46 octets (B)</p> Signup and view all the answers

What is the interpretation of 10BASE5 in terms of network specifications?

<p>10 Mbps, Baseband, 500 m end-to-end coverage (C)</p> Signup and view all the answers

What is the primary requirement for the connecting cable in 100BASE-T as compared to 10BASE-T?

<p>Category 5 cable instead of Category 3 (C)</p> Signup and view all the answers

What is the main benefit of using 100BASE-FX in full duplex mode?

<p>Increased end-to-end coverage distance (B)</p> Signup and view all the answers

What distinguishes 1000BASE-T from other Ethernet standards such as 10BASE-T and 100BASE-T?

<p>$1$ Gbps data transfer rate (B)</p> Signup and view all the answers

What is the interpretation of 10BASE-FL in terms of network specifications?

<p>$10$ Mbps Ethernet over fiber with a maximum distance of nearly $2$ km (A)</p> Signup and view all the answers

What is the main function of the IEEE 802.3 standard in industrial networks?

<p>To provide deterministic performance and low cost transmission in LANs (A)</p> Signup and view all the answers

What characterizes ThinNet/10BASE2 as compared to ThickNet/10BASE5?

<p>Easier handling but requires a BNC 'T' connector at each end node (D)</p> Signup and view all the answers

What distinguishes 100BASE-FX from 100BASE-T in terms of network specifications?

<p>The use of fiber optics instead of twisted pair cables (B)</p> Signup and view all the answers

What is the significance of using RG58A/U coaxial cable in network connections?

<p>It allows for easy termination in $50$-ohm precision resistors at each end node (A)</p> Signup and view all the answers

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