Category Archives: Switching

Cisco Dynamic Trunking Protocol (DTP) Explained

Understanding Dynamic Trunking Protocol (DTP) The Dynamic Trunking Protocol (DTP) is a Cisco proprietary protocol that is automatically enabled on Catalyst 2960 and Catalyst 3560 Series switches. DTP is used to negotiate forming a trunk link between two or more Cisco devices before actually forming the trunk connection. The main benefit of DTP is to increase traffic on a… Read More »

DHCP Snooping Explained

WHAT IS DHCP SNOOPING? The Dynamic Host Configuration Protocol (DHCP) allocates IP addresses dynamically, it leases addresses to connected devices and the addresses can be reused when no longer needed. All connected Hosts and end devices that require IP addresses obtained through DHCP must communicate with a DHCP server across the LAN. DHCP snooping acts like a firewall… Read More »

What is Link Layer Discovery Protocol (LLDP)?

Understanding LLDP and LLDP-MED The smooth running operation of the various networking devices in a LAN or switched network means that all protocols and applications are enabled and that all devices and are configured correctly. However, the larger the network gets, the more difficult it will be for the network administrator to control, manage and sort out configuration problems. This… Read More »

What is Stateful DHCPv6: DHCPv6 Autoconfiguration- Server and Client.

How to Configure DHCPV6 Stateful Auto-configuration (Server and Client ) DHCPv6 Server command Terms: IPv6 dhcp pool: This command creates a pool and enters the router in DHCPv6 configuration mode. Address : This command is used to indicate the pool of addresses to be allocated by the server. The lifetime option indicates the valid and preferred lease times in seconds.… Read More »

What is GLBP? Explained with Examples

Understanding Gateway Load Balancing Protocol (GLBP) Gateway Load Balancing Protocol (GLBP) is a Cisco proprietary solution for redundancy and load balancing in an IP network. GLBP allow automatic selection and simultaneous recovery from first hop router failures. GLBP provides load balancing over multiple (router) gateways using a single virtual IP address and multiple virtual MAC addresses.  Each host… Read More »

How Switches Forward Frames Expained

Switch Packet Forwarding Methods. A switch uses different method of forwarding frames in Ethernet network. These methods are: Store-and-Forward or Cut-through Switching. Store-and-Forward Switching In store-and-forward switching, when the switch receives the frame, it stores the received data in buffers until the complete frame has been received. While in the storage process, the switch checks and analyses the… Read More »

What is Switch Root Bridge and Port ?

STP: The Root Bridge In STP configured switched LAN or broadcast domain, a switch is designated as the root bridge. The root bridge serves as an administrative point for all spanning-tree calculations to determine which redundant links to block. An election process determines which switch becomes the root bridge. Each switch has a Bridge ID (BID) that is made up of a… Read More »

What is Wide Area Network? – WAN Explained with Examples

When an  individual Company or Organization has locations that are separated by large geographical distances, it will be a matter of necessity to connect these individual locations so as to share, exchange and manager data or communication. To achieve this, the organisation needs a Telecommunication Service Provider (TSP) to interconnect the LANs at the different locations. Telecommunications Service Providers manage… Read More »

What is Switch Root Port?

 Root Port Selection on a Switch. Best Paths to the Root Bridge After the root bridge has been designated for the spanning tree process, the next process is to determine the best paths to the root bridge from all destinations in the network. The best path resolution is carried out by the summing up of the individual port… Read More »

What is Functions of a Switch? Explained with Examples

Features and Functions of Cisco Switches. Things to consider when selecting a Switch for a Network. To select the appropriate switch for a layer in a particular network, you need to have specifications that detail the target traffic flows, user communities, data servers, and data storage servers. Company needs a network that can meet evolving requirements. Traffic flow… Read More »