##  [Address Resolution](/address-resolution-0) 

 Definition

The process that maps a high-level identifier (a name or logical identifier) to a locatable network address or endpoint identifier used for delivery, producing the address information required by forwarding or connection-establishment procedures.

 

 

 

 

 

 





## Principle

Principle

Address resolution separates naming from routable location: a stable or human-meaningful identifier is translated into a concrete delivery address so transport and forwarding mechanisms can operate.

 

 

 

 

 





## Demonstration

Demonstration

Illustrative scenario: A client wants to contact service.example. The client issues a resolution request to a resolver, receives an IP address result, and then uses that address as the packet destination so routers can forward the packet toward the endpoint.

 

 

 

 

## Misapplication

Misapplication

Treating address resolution as equivalent to routing—mistakenly assuming the resolver selects the network path. The semantic error is conflating the translation of identifier→address with the separate process that chooses next hops or end-to-end paths.

 

 

 

 

 





## Consequence

Consequence

When resolution succeeds and is current, higher-layer entities obtain routable addresses and delivery can proceed; when resolution fails or is stale, messages are undeliverable or misdelivered, and protocols may fall back to retries, alternate endpoints, or cached (possibly incorrect) addresses.

 

 

 

 

## Reversal

Reversal

In systems that embed routable location into identifiers (for example, content-addressable or flat-address schemes) or where source routing specifies the path, a distinct resolution step may be unnecessary or substantially different in role.

 

 

 

 

 





## Boundary

Boundary

Clearly within: mapping a DNS name to an IP address used for packet delivery. Boundary case: a directory that supplies service instances where additional selection/authorization is required. Clearly outside: path computation or hop-by-hop routing decisions, which use addresses but do not themselves perform identifier→address translation.

 

 

 

 

 





## Semantic Tension

Semantic Tension

Privacy ↔ Reachability — resolving an identifier can expose the mapping between a human-friendly name and a network location, improving reachability while potentially reducing privacy.

 

 

 

 

 





## Synthesis

Synthesis

Address resolution is an operational translation layer: it converts abstract identifiers into concrete delivery addresses so forwarding and connection mechanisms can act, and its correctness and freshness directly condition whether addressing yields reachability.