Overview: OSPFv3 has the same functionality as OSPFv2, but uses IPv6 addresses to communicate with OSPFv3 peers. Study Notes: OSPFv3 uses the same SPF algorithm as OSPFv2 OSPFv3 has a separate process than OSPFv2 OSPFv3 maintains separate neighbor tables, topology tables and routing tables from OSPFv2 Similarities Link State SPF algorithm Metric is cost […]
Overview: Open Shortest Path First version 2 (OSPFv2), is a non-proprietary link-state routing protocol that is typically used within an autonomous system (otherwise known as an interior gateway protocol). The v2 simply means you are using IPv4 addresses. Study Notes: OSPF is a Link-state routing protocol Dijkstra’s Shortest Path First algorithm is used to […]
Overview: A floating static route is a static route with an administrative distance higher than that of the routing protocol in use. In this way, the floating static route will only appear in the routing table if the existing static or dynamic route is lost. Study Notes: Floating static routes are static routes with the […]
Overview: A host route is used to route traffic to a specific host. The subnet mask in the route will always be all 1’s. That means the subnet mask for a host route will be /32 for IPv4 and /128 for IPv6. Study Notes: A host route is configured to route packets to a […]
Overview: A network route is used to route traffic to a specific network. Study Notes: A network route is configured to route packets to a specific network You may add many different network routes to the routing table Without a network route, packets will get routed via the default route if one exists Network […]
Overview: A default route is used to route traffic to any network that is not in your routing table. Without a default route defined, any traffic destined to a network that is not in the routing table will be dropped by the router. Study Notes: A default route is configured to route packets to […]
Overview: Switch Virtual Interfaces (SVI) are vlan interfaces with IP addresses configured on switches. Study Notes: Switch Virtual Interfaces (SVI) are vlan interfaces with IP addresses Yes it’s Switch Virtual Interface not Switched Virtual Interface They are found on layer 2 and layer 3 switches The physical switchport is a layer 2 access or […]
Overview: Router on a stick is a means of connecting to two or more subnets via a single physical Layer 3 interface using subinterfaces. Study Notes: Router on a stick, a.k.a. One armed router or Stub router Router on a stick is useful when needing to connect to multiple subnets from a single router […]
Overview: Frame rewrite is a crucial step in routing a packet through a router. Frame rewrite is determining how to construct the Layer 2 frame header to allow the packet to be properly encapsulated toward its next hop and forward the packet out the correct interface. Study Notes: Here is the process: Packet arrives […]
Overview: Understand how a packet is handled by different devices along a path in a network. In this scenario, the sender is PC1 and the receiver is PC2. Study Notes: PC1 creates a packet with the destination IP address of PC2 PC1 determines that PC2’s IP address is on a different network PC1 looks up […]