Learn Directly from Engineers
IntroductionOSPF stands for open shortest path first. OSPF is a dynamic routing protocol that comes under IGP(interior gateway protocol). It is also known as link state protocol. It works on shortest path first algorithm (SPF). To advertise routes information OSPF running routers send LSAs to exchange information with neighbors.
Etherchannel groups multiple interfaces together to act as a single interface. Or we can also say etherchannel bundles multiple physical interfaces into 1 logical channel. And this channel is treated as single link. Etherchannel is also called as port channel and link aggregation. Why we need etherchannel?In general, we
In this lesson, we will discuss layer 2 discovery protocol. CDP (Cisco Discovery Protocols)LLDP (Link Layer Discovery Protocol)The main function of these protocols to collect and share information with neighbor devices. Shared information includes host name, IP address and device type etc. When a device receive a CDP/
Intervlan is the process of communication between different VLANs. In this lesson, we will study different methods of intervlan. Traditional method ROAS (router on a stick) SVI (Switch Virtual Interface) method Traditional Method of IntervlanTraditional approach of intervlanThis traditional method of intervlan is very simple and easy to understand. In
DTP stands for dynamic trunking protocol. DTP allows Cisco switches to dynamically learn their interface status (access or trunk) without manual configuration. It means when one switch interface is configured, other switch automatically learn the status (doesn't wait for manual configuration). For example two switches(S1 and S2) are connected
SNMP stands for Simple Network Management Protocol. Its name itself defines its function- network management. In simpler words, SNMP is a network management protocol that is used to monitor and manage the network devices (like switches, routers, printers). It works on application layer. Versions: SNMPv1 SNMPv2 SNMPv3 How SNMP works?
Introduction: DAI is a layer 2 security, configured on switches. It monitors the incoming ARP messages on untrusted ports. To filter, DAI compares these messages with DHCP snooping binding table and any configured ARP ACLs. If ARP message doesn’t match with table entry, then it discards the packet. To
Introduction:ACL stands for Access Control List. ACL name itself define its function, ACL rules are configured to control the access inside the network (which hosts are allowed and which aren't). Sometime ACL also known as packet filter firewall, as ACL filters the packet based on configured rules, it decides
In this article, we will learn concept of SDN (software defined Network) or controller-based networking. Before dive into SDN concept, first we will discuss 3 planes of network devices. Understanding of these plane functions will help you to understand the concept of SDN. Network devices task are categorized in 3
In this lesson, we will learn security fundamentals- that include possible security attacks, corresponding mitigation technique that is implemented to prevent the attack. First we need to understand why an organization needs security? There are 3 security principles i.e. CIA- confidentiality Integrity and Availability. Confidentiality- A system is said
In this post, we will learn how a packet flows during ping process when destination is on different network. In computer networking, ping command is used to check connectivity. Ping works on ICMP protocol. There are two ping messages- ICMP echo reply ICMP echo request Network topology: two different networks