ARP is responsible for mapping IPv4 Address# to Media Access Control Address (MAC)#. See Reverse Address Resolution Protocol (RARP) for the reverse mapping. Typically, it is used on broadcast networks such as Ethernet#, Token Ring, and FDDI.
Address Resolution Protocol (ARP)
- TTP3121 Chapter 1: Introduction
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Static Routing
In #Cisco Internetwork Operating System (IOS), this could be done using the command
ip routeand supply it with the destination network address, its subnet mask and the next-hop router’s IP address or the outgoing interface (called exit interface). Since using next-hop router’s IP address for static route could result in Recursive Route Lookup#, it is advised to use exit interface when ever possible. However, in the case of configuring on an Ethernet# link, the best practice is to configure with both the next-hop router’s IP address and the exit interface to avoid Address Resolution Protocol (ARP)# shenanigans. -
Router
The physical structure of Router mainly consists of CPU, RAM, ROM, Flash, NVRAM and interfaces or ports. RAM not only stores the Routing Table#, but also holds Address Resolution Protocol (ARP) cache and fast-switching cache, performs packet buffering, and provides temporary memory for the running configuration file. NVRAM provides permanent storage for startup configuration file. Various versions of #Cisco Internetwork Operating System (IOS) are stored in Flash. ROM is where the power-on self test (POST) diagnostic software and bootstrap program (boot up partial IOS) located.
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Reverse Address Resolution Protocol (RARP)
The functionality of RARP is the exact reverse of Address Resolution Protocol (ARP), that is to map Media Access Control Address (MAC)# to IPv4 Address#. It is especially useful for a diskless host to obtain a valid IP address from its server.
- Network Layer