Network Layer Protocol

A.

Open Shortest Path First, Internet Protocol, and Routing Information Protocol are all protocols implemented in the Network Layer.

Domain: Telecommunications and Network Security References: AIO 3rd edition.

Page 429 Official Guide to the CISSP CBK.

Page 411

The OSI (Open Systems Interconnection) model is a reference model that describes how different applications and devices communicate over a network. The model has seven layers, and each layer has its own specific protocols and functions. The network layer is the third layer of the OSI model, and its primary function is to manage logical addressing and routing of data packets across a network.

Of the options given, the protocol that is NOT implemented in the network layer of the OSI model is the Hyper Text Transport Protocol (HTTP). HTTP is a protocol that operates at the application layer of the OSI model and is used to transfer data between web servers and clients.

The other options, Open Shortest Path First (OSPF), Internet Protocol (IP), and Routing Information Protocol (RIP), are all protocols that operate at the network layer of the OSI model.

OSPF is a link-state routing protocol that is used to route IP traffic within a single autonomous system. It uses a hierarchical structure and calculates the shortest path between two points based on link-state information.

IP is the primary protocol used at the network layer of the OSI model. It provides logical addressing and routing functionality and is responsible for transmitting data packets across a network.

RIP is a distance-vector routing protocol that is used to determine the best path for IP traffic within a network. It is designed to support small to medium-sized networks and uses a hop count metric to determine the best route.

In summary, HTTP is not implemented in the network layer of the OSI model, while OSPF, IP, and RIP are all protocols that operate at the network layer.