Network Fundamentals Lab Introduction Cisco Packet tracer GNS3 EVE-NG Open Systems Interconnection OSI Model Review OSI Layer 1 – The Physical Layer OSI Layer 2 – Data-Link, Describe and verify switching concepts MAC LLC OSI Layer 3 – The Network Layer OSI Layer 4 – The Transport Layer TCP UDP Compare TCP to UDP OSI […]
Why FHRP? A reliable network must address the following characteristics: High Availability and Fault Tolerance, Scalability, Security, and QoS. For a fault-tolerant network we must address the single of points of failures. A reliable network provides redundancy by implementing a packet-switched network wherein each packets could take a different path to the destination. Not that […]
Scope of Work You’ll be sorry if you miss CCNA to climb your IT career ladder. Your career in networking begins with CCNA. The Cisco certification program was drastically changed on Feb. 24, 2020. There are no longer multiple different CCNA exams and certifications – only a single, comprehensive exam is available. The new exam’s code is 200-301 […]
In this section, let’s see vPC initialization process; then we will discuss on different failure scenarios: The minute you enable vPC feature, the switch sends UDP 3200 ping keepalive to establish connectivity with its peer. Once the connectivity established, the switch in turn enables CFSoE to synchronize the control plane and to carry PDUs for […]
In this topic, we are going to proceed with basic vPC configuration on NX-OS. Let’s review what we would need upfront before the configuration. We would need L3 connectivity for Peer Keepalive. For example, the management interface. We would require to enable vPC and LACP features. LACP must be used on all member interfaces as […]
After covering Port-Channel let’s know talk about virtual Port Channel (vPC). virtual Port Channel allows two NX-OS switches to provide a single port-channel to the downstream devices (Similar to VSS and Stackwise in Catalyst environment). Without vPC, STP blocks one of the ports. In addition, you don’t have high availability. Note that the downstream switch […]
Link Aggregation Port-channel is to NX-OS as EtherChannel is to Catalyst. Juniper calls it Aggregated Ethernet interface while Microsoft refers to NIC Teaming . In fact, all refer to the same concept of grouping couple of ports together in to a single logical interface. Above all, The main advantage of grouping some ports into a […]
In this post I am going to discuss about different network architecture: the traditional campus design, then Spine-Leaf (AKA Leaf-and-spine architecture) and what problems the spine-leaf network design addresses. Classic Three-Tier Architecture You can have a flat network design with a large broadcast domain wherein all network equipment, PCs, printers, APs, connects to each other […]
Network Layer Jobs IP Routing One of the main roles of the Network layer is to forward packets between hosts. A host can send a packet to: Itself: Host can use it’s own interface IP or its loopback address to send a packet to itself. Same local network: When a host wants to send a […]
In this article we are going to talk about different variation of SPF (Shortest Path First). Dijkstra’s SPF is the algorithm that Link State Routing Protocols such as OSPF and IS-IS are using. It has many variations which we will cover them here: CSPF (Constraint Based SPF) CSPF is being used in Traffic Engineering Dynamic […]
Elissa Garlin
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