Network Engineer – F.O.C.U.S Follow One Course Until Successful
The Link Layer Discovery Protocol (LLDP) is a vendor-neutral link layer protocol in the Internet Protocol Suite used by network devices for advertising their identity, capabilities, and neighbors The protocol is formally referred to by the IEEE as Station and…
Read more
CDP stand for Cisco Discovery Protocol and is a Cisco Proprietary Protocol and Interfaces must support SNAP ( Support Subnetwork Access Protocol ) Headers The standard industry equivalent is LLDP. CDP isn’t just a simple protocol there is more…
Read more
Regular Expressions A regular expression is a pattern (a phrase, number, or more complex pattern). Regular expressions are case sensitive and allow for complex matching requirements. Simple regular expressions include entries like Serial, misses, or 138. Complex regular expressions include…
Read more
This post is about what i have encounter and some debate around thy is subject. Some say that vlan1 should be use and some say that it should not. On part my part and point of view of my little…
Read more
BFD Operation BFD provides a low-overhead, short-duration method of detecting failures in the forwarding path between two adjacent routers, including the interfaces, data links, and forwarding planes. BFD is a detection protocol that you enable at the interface and routing…
Read more
The IPV4 Option is in the IHL ‘Internet Header Length’ Field, it is a minimum value of 5 and if it is that mean that there is no options configured and we have a 20 bytes ip header. The Internet…
Read more
IP Maximum Transmission Unit (MTU) IPv4 routers will fragment automatically to fit within the MTU (unless DF – Don’t Fragment option is set). IPv6 routers will not fragment, and will drop packets that are larger than MTU. IPv4 requires that…
Read more
Time to live (TTL) is a hop limit set to limit the lifetime of data on a network. This prevents data from looping endlessly. Each hop decrements the value by 1. If TTL reaches 0, the data is discarded and…
Read more
ICMP offers troubleshooting facility as well as error reporting for the packets 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2…
Read more