Computer Networks, unit: The Network Layer and Routing. Core concepts, terminology, and worked-example cues a college student meets for this unit, building on prior units without repeating them. Front: a term, concept, or short problem cue. Back: the definition, explanation, or answer.
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- What is the Network layer responsible for?
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Logical addressing and routing data across multiple networks- What is an IP address?
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A unique logical address identifying a device on a network- What is IPv4?
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The fourth version of the Internet Protocol, using 32-bit addresses- What is IPv6?
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The newer Internet Protocol version, using 128-bit addresses to vastly expand the address space- Why was IPv6 developed?
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IPv4's roughly 4.3 billion addresses were becoming insufficient for the growing number of internet-connected devices- What is a subnet?
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A logical subdivision of a larger network- What is subnet masking used for?
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Determining which portion of an IP address represents the network versus the host- What is CIDR (Classless Inter-Domain Routing)?
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A method for allocating IP addresses and routing more flexibly than old fixed classes- What is a router?
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A device that forwards data packets between different networks based on IP address- What is routing?
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The process of selecting a path for data to travel across interconnected networks- What is a routing table?
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A data structure a router uses to determine the best path for forwarding packets- What is a default gateway?
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The router a device sends traffic to when the destination is outside its local network- What is NAT (Network Address Translation)?
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A technique that maps private internal IP addresses to a public IP address for internet access- What is a private IP address range used for?
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Addressing devices within a local network, not directly reachable from the public internet- What is a public IP address?
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An address that is globally unique and routable on the public internet
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