Lecture-3 ISO Model, Network Security, and Protocols

Source and destination addresses to the frame the

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: is the Media Access Control (MAC) address, which is a 6-byte address written in hexadecimal notation. The first 3 bytes of the address indicate the vendor or manufacturer of the physical network interface. The last 3 bytes represent a unique Lecture-3 16 number assigned to that interface by the Data Link Layer … cont. Among the protocols at the Data Link layer (layer 2) of the OSI model, the two you should be familiar with are Address Resolution Protocol (ARP) and Reverse Address Resolution Protocol (RARP). ARP is used to resolve IP addresses into MAC addresses. Traffic on a network segment (e.g., cables across a hub) is directed from its source system to its destination system Lecture-3 17 using MAC addresses. Data Link Layer … cont. Contains two sub-layers: the Logical Link Control (LLC) sub-layer and the MAC sub-layer. Network hardware devices that function at layer 2, the Data Link layer, are switches and bridges. These devices support MAC-based traffic routing. Switches receive a frame on one port and send it out another port based on Lecture-3 18 the destination MAC address. Network Layer Responsible for adding routing and addressing information to the data. The Network layer accepts the segment from the Transport layer and adds information to it to create a packet. The packet includes the source and destination IP addresses. Lecture-3 19 Network Layer …cont. Protocols working at this layer: Internet Control Message Protocol (ICMP) Routing Information Protocol (RIP) Open Shortest Path First (OSPF) Border Gateway Protocol (BGP) Internet Group Management Protocol (IGMP) Internet Protocol (IP) Internet Protocol Security (IPSec) Lecture-3 20 Network Layer …cont. Responsible for providing routing or delivery information. Not responsible for verifying guaranteed delivery (that is the responsibility of the Transport layer). Manages error detection and node data traffic (i.e., traffic control). Routers are among the network hardware devices that function at layer...
View Full Document

This note was uploaded on 01/21/2014 for the course IT 205 taught by Professor Kurts during the Winter '08 term at University of Phoenix.

Ask a homework question - tutors are online