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Category: CCNA 200-125

CCNA 3.8.c: Host Route

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 […]

CCNA 3.8.b: Network route

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 […]

CCNA 3.8.a: Default route

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 […]

CCNA 3.7: Compare and contrast interior and exterior routing protocols

Overview: Interior routing protocols serve a different purpose than exterior routing protocols.  Interior routing protocols discover paths between networks whereas exterior routing protocols route between autonomous systems.   Study Notes: Areas introduce heirarchy into network architectures. An autonomous system is essentially a grouping of areas Interior Routing Protocols discover paths between networks RIP EIGRP OSPF […]

CCNA 3.6: Compare and contrast distance-vector and link-state routing protocols

Overview: Dynamic routing protocols are categorized as either distance-vector protocols or link-state protocols   Study Notes: Distance-Vector Routing Protocols The full routing table is sent in periodic updates to neighbors, which requires more bandwidth Distance is the main metric used to calculate routes RIP uses hop count IGRP uses bandwidth and delay Slower to converge […]

CCNA 3.5: Compare and contrast static routing and dynamic routing

Overview: Dynamic routing protocols automatically detect and adapt to network changes whereas Static routing requires manual intervention to adjust to network changes.  That automation comes at the cost of bandwidth, CPUs and buffer space.   Study Notes: Configuration Static routes – manual configuration for every single route. Gets more difficult to manage as the network […]

CCNA 3.4.b: Switch Virtual Interface (SVI)

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 […]

CCNA 3.4.a: Router on a Stick

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 […]

CCNA 3.4: Configure, verify and troubleshoot inter-VLAN routing

Overview: VLANs divide broadcast domains in a LAN environment. Inter-VLAN routing is necessary when a host in one VLAN needs to communicate with a host in another VLAN because the packets must be routed between the VLANs. On Catalyst switches it is accomplished by the creation of Layer 3 interfaces called switch virtual interfaces (SVIs).  […]