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Category: CCNA

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).  […]


CCNA 3.3.a: Admin distance

Overview: Admin distance is what is used to select the best path when a router has two different paths to the same destination via two different routing protocols.   Study Notes: Most routing protocols are not compatible with other protocols. In a network with multiple routing protocols, being able to select the best path between […]


CCNA 3.3: Describe how a routing table is populated by different routing information sources

Overview: A routing table consists of routes to destination networks that are learned either statically or dynamically by different routing sources.   Study Notes: The routing source populates the routing table Automatically by the router for connected and local routes Statically by an administrator. The administrator statically configures how to get to remote networks. Dynamically […]


CCNA 3.2.g: Gateway of last resort

Overview: Gateway of last resort is the default route configured on the router   Study Notes: Default routes are used to direct packets addressed to networks not explicitly listed in the routing table. Default routes are invaluable in topologies where learning all the more specific networks is not desirable, as in case of stub networks, […]


CCNA 3.2.f: Metric

Overview: The metric is a value produced by the routing protocol’s algorithm.  The metric value determines the best path to a destination network within a routing protocol.     Study Notes: To determine the metric: RIP uses hop count EIGRP uses K values OSPF uses reference bandwidth Metric is used to compare routes to a destination […]


CCNA 3.2.e: Administrative distance

Overview: Administrative distance is what is used to select the best path when a router has two different paths to the same destination via two different routing protocols.   Study Notes: Most routing protocols are not compatible with other protocols. In a network with multiple routing protocols, being able to select the best path between […]


CCNA 3.2.c: Next hop

Overview: Next hop identifies the IP address of the next router inline to forward the packet to. Study Notes: Connected networks and Local networks do not have a next hop The first next hop address in the routing table is for the RIP route to network 172.16.2.0/24.  The next hop is 209.165.200.226 The next hop […]


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