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Questions and Answers
What is the primary purpose of the OSI physical layer?
Why are two strands of fiber used for a single fiber optic connection?
Which characteristic describes crosstalk in networking?
What procedure is used to reduce the effect of crosstalk in copper cables?
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Which situation matches the appropriate use of network media?
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What factors could influence the differences in throughput on a company backbone?
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What are two characteristics of fiber-optic cable?
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What is a primary role of the Physical layer in transmitting data on the network?
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What causes crosstalk within the cable pairs in an unshielded twisted-pair copper wire network?
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What type of cabling is shown in the provided graphic?
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Which switching method has the advantage of lower latency compared to the store-and-forward method?
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Which of the following MAC addresses is a multicast address?
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What is wrong with the displayed termination in the exhibit?
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Which types of UTP cables can be used to connect devices when the PC is connected to the console port of the switch and all other connections are made through FastEthernet links?
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Which port does Switch0 use to send frames to the host with the IPv4 address 10.1.1.5?
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What does the term 'attenuation' mean in data communication?
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Which of the following makes fiber preferable to copper cabling for interconnecting buildings?
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Which OSI physical layer term describes the process by which one wave modifies another wave?
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Which OSI physical layer term describes the capacity at which a medium can carry data?
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Which OSI physical layer term describes the measure of the transfer of bits across a medium over a given period of time?
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Which two devices commonly affect wireless networks?
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Which two statements describe the services provided by the data link layer?
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What is the function of the CRC value that is found in the FCS field of a frame?
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What is contained in the trailer of a data-link frame?
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Which statement describes a characteristic of the frame header fields of the data link layer?
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A network team is comparing physical WAN topologies for connecting remote sites to a headquarters building. Which topology provides high availability and connects some, but not all, remote sites?
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Which two fields or features does Ethernet examine to determine if a received frame is passed to the data link layer or discarded by the NIC?
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Which media communication type does not require media arbitration in the data link layer?
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Which statement describes an extended star topology?
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What is a characteristic of the LLC sublayer?
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Study Notes
OSI Physical Layer
- The primary purpose of the OSI physical layer is to transmit data bits over a physical medium.
- The physical layer is responsible for transmitting data on the network.
Fiber Optic Connections
- Two strands of fiber are used for a single fiber optic connection, one for transmitting and one for receiving.
Crosstalk
- Crosstalk is a characteristic that describes the unwanted signal interference between two adjacent copper wires.
- Shielding is used to reduce the effect of crosstalk in copper cables.
Network Media
- The appropriate use of network media depends on the situation, such as using fiber optic cables for high-bandwidth connections or copper cables for shorter distances.
Throughput Factors
- Factors that influence differences in throughput on a company backbone include network congestion, bandwidth, and data packet size.
Fiber-Optic Cables
- Two characteristics of fiber-optic cables are high bandwidth and low latency.
- Fiber optic cables are preferred over copper cabling for interconnecting buildings because of their higher bandwidth and lower latency.
Data Transmission
- Attenuation refers to the weakening of a signal over a long distance, which affects data transmission.
MAC Addresses
- A multicast address is a MAC address that starts with 01:00:5e.
Switching Methods
- The cut-through switching method has lower latency compared to the store-and-forward method.
UTP Cables
- UTP cables can be used to connect devices, but the type of cable used depends on the connection, such as using Category 5e or higher for FastEthernet links.
Switching and Routing
- Switch0 uses the destination MAC address to send frames to the host with the specified IPv4 address.
OSI Physical Layer Terms
- OSI physical layer terms include:
- Attenuation: the weakening of a signal over a long distance.
- Bandwidth: the capacity at which a medium can carry data.
- Throughput: the measure of the transfer of bits across a medium over a given period of time.
- Intermodulation: the process by which one wave modifies another wave.
Wireless Networks
- Two devices that commonly affect wireless networks are access points and routers.
Data Link Layer
- The data link layer provides two services: framing and error detection and correction.
- The function of the CRC value in the FCS field of a frame is to detect errors in the transmission.
- The trailer of a data-link frame contains the FCS and error-checking data.
- The frame header fields of the data link layer include source and destination MAC addresses, and the frame length.
WAN Topologies
- A partial mesh topology provides high availability and connects some, but not all, remote sites to a headquarters building.
Ethernet Frames
- Ethernet examines the destination MAC address and FCS fields to determine if a received frame is passed to the data link layer or discarded by the NIC.
Media Communication
- Point-to-point media communication type does not require media arbitration in the data link layer.
Extended Star Topology
- An extended star topology is a type of network topology where multiple star networks are connected to a central hub or switch.
LLC Sublayer
- The LLC sublayer is responsible for providing multiplexing, flow control, and error detection and correction services.
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Description
Test your knowledge on Ethernet concepts in this quiz covering modules 4-7 of the Introduction to Networks (Version 7.00) course. Explore topics such as the purpose of the OSI physical layer and the significance of two strands of fiber.
