Correct Answer: D
Explanation/Reference:
Explanation:
OSI network-layer addressing is implemented by using two types of hierarchical addresses: network service access-point addresses and network-entity titles.
A network service-access point (NSAP) is a conceptual point on the boundary between the network and the transport layers.
The NSAP is the location at which OSI network services are provided to the transport layer.
Each transport-layer entity is assigned a single NSAP, which is individually addressed in an OSI internetwork using NSAP addresses.
Network Service Address Point (NSAP) address is the equivalent of an IP address for an OSI network; A NSAP address is a hexadecimal address with a length of up to 40 hexadecimal digits.
NSAP addresses are used in ATM and IS-IS.