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CCNA2: Routing concepts (Network Chracteristics (Topology (Physical…
CCNA2: Routing concepts
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Router Functions
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effectiveness of internetwork communications depends, to a large degree, on the ability of routers to forward packets in the most efficient way possible.
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Router can forward packet that came in in one type of data link frame then send it out on another type of datalink frame
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Connect Devices
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Central site
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Layer 2 switches connect redundantly to multilayer Layer 3 switches using Ethernet fiber-optic cables (orange connections).
Layer 3 multilayer switches connect to an Ethernet interface on the edge router using Ethernet cables.
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Default Gateway
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A router is also usually configured with its own default gateway. This is known as the Gateway of Last Resort.
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Device LEDs
On switches the mode button can be used to configure LEDs to display different things, in this case the LED meaning is fixed as this is the back of a router
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Enable IP on a switch
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- Goto vlan interface (interface vlan 1)
- Give address to interface (ip address <address> <subnet mask>)
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- Set default gateway ip default-gateway in global configuration mode
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Best Path
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Load balancing
If a router has two paths with the same metric then the router forwards the packets to both paths equally
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