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When one host sends data to another, that data has both a MAC destination address and an IP address and an IP destination ( Layer 2 destination and Layer 3 destination). Up to this point we’ve been working with L2 destination addresses as opposed to L3 destination. We’re now going to move up a layer […]
The Enemies Within It’s easy to think about network security in terms of playing defense from attackers outside our network. Thing is, plenty of successful attacks have been launched from inside a network, utilizing seemingly innocent network services and protocols such as DHCP, ARP, CDP, Telnet, and even VLANs. Port Security A basic Cisco security […]
Switch and Router Memory : The memory sections and functions discussed in this section are the same for switches and routers, but to avoid saying “switches and routers” 300 time, we’ll just say “switches”. Of the following, take note of which ones lose their contents on a reload and which do not. ROM : Read-Only […]
