cisco ccna resume

cisco ccna resume.The role of the Layer 3 protocol is to enable communication and does not have to care about the specific transmission medium or other Layer 2 properties (e.g.for example, it does not have to care whether the information needs to be transmitted over a wired or wireless network). The Internet Protocol (IP) is a commonly used Layer 3 protocol.Internet Protocol (IP) is a common Layer 3 protocol. As a security professional, it is critical that you understand how IP works within a communications network.There are two different versions of IP: IP version 4 (IPv4) and IP version 6 (IPv6). o While some concepts remain the same between the two versions of the IP protocol, IPv6 is not an update to IPv4 and can be thought of as a completely new protocol. This section focuses on IPv4 o The next section will cover the basics of IPv6, focusing on IPv4 and IPv61.4 Internet Protocols and Layer 3 Technologies 45differences between them.Before diving into more detail, it is important to understand the basic method of transporting IP packets, namely the Layer 3 forwarding method. Figure 1.42 shows a simple example network in which Host A is directly connected to SW1, the switch that provides LAN access to hosts within Site A; Host B is also directly connected to Site B's LAN access switch, SW2Once Site A and B are interconnected by two routers (R1 and R2).10.0.3.1 10.0.3.210.0.1.1 10.0.2.2 Figure 1-42 - A Simple NetworkThe reader should master the following concepts.