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Router is a layer 3 or 4 device if your ans is layer 3 then while applying an extended access list on router interface how specifying port no is aloud as it comes under layer 4 protocols?
Wiki User
∙ 11y ago
A router is a layer 3 device.In general, a Layer-3 switch (routing switch) is primarily a switch (a Layer-2 device) that has been enhanced or taught some routing (Layer 3) capabilities. A router is a Layer-3 device that simply do routing only. In the case of a switching router, it is primarily a router that may use switching technology (high-speed ASICs) for speed and performance (as well as also supporting Layer-2 bridging functions).
As illustration, here are some examples
Layer-2 switches
Cisco: Catalyst 2950, 2960 series
Layer-3 switches or routing switches
Cisco: Catalyst 3550, 3560, 3750, 4500, 6500 series
Juniper: EX series
Routers (with some bridging and/or security features) or switching routers
Cisco: 1800, 1900, 2600, 2800, 2900, 3700, 3800, 3900, 7200, 7600, ASR 1000 series
Juniper: MX series, J series, M series
Wiki User
∙ 11y ago
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