6.1-1. Link-layer services. Which of the following services may be implemented in a link-layer protocol? Select one or more statements.Group of answer choicesBit-level error detection and correction.Flow control between directly connected nodes.Coordinated access to a shared physical medium.Reliable data transfer between directly connected nodes.Lookup and forwarding on the basis of an IP destination address.End-end path determination through multiple IP routers.TLS security (including authentication) between directly connected nodes.Multiplexing down from / multiplexing up to a network-layer protocol.
Question
6.1-1. Link-layer services. Which of the following services may be implemented in a link-layer protocol? Select one or more statements.Group of answer choicesBit-level error detection and correction.Flow control between directly connected nodes.Coordinated access to a shared physical medium.Reliable data transfer between directly connected nodes.Lookup and forwarding on the basis of an IP destination address.End-end path determination through multiple IP routers.TLS security (including authentication) between directly connected nodes.Multiplexing down from / multiplexing up to a network-layer protocol.
Solution
The services that may be implemented in a link-layer protocol include:
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Bit-level error detection and correction: This is a fundamental service of the link layer. It ensures that data is transmitted correctly between nodes.
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Flow control between directly connected nodes: This is another key service of the link layer. It manages the pace of data transmission between two nodes to prevent a fast sender from overwhelming a slow receiver.
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Coordinated access to a shared physical medium: This is also a service provided by the link layer. It manages access to the shared medium to prevent collisions.
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Reliable data transfer between directly connected nodes: This service ensures that data is delivered reliably between directly connected nodes.
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Multiplexing down from / multiplexing up to a network-layer protocol: This service allows multiple network-layer protocols to use the same link-layer protocol.
The services that are not typically provided by a link-layer protocol include:
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Lookup and forwarding on the basis of an IP destination address: This is typically a service provided by the network layer.
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End-end path determination through multiple IP routers: This is also a service provided by the network layer.
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TLS security (including authentication) between directly connected nodes: This is typically a service provided by the transport layer or application layer, not the link layer.
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