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How do switches know where to send packets?
When a frame enters into the switchport, the switch checks the dynamic table in memory which stores Physical Port and MAC address pairs. Switch then knows which port to use to forward the frame. Remember: switch does not look into the IP packet and forwards frame as is based on destination MAC address.
How does ping work on a switch?
The ping command uses a DNS query to determine the IP address for the specified host, and then pings the host based on its IP address. The ping command has a number of other switches that you’ll use rarely, if ever. Some of these switches are available only for some operating systems.
How does a switch route traffic?
By moving Ethernet frames between the switch ports, a switch links the traffic carried by the individual network connections into a larger Ethernet network. Ethernet switches perform their linking function by bridging Ethernet frames between Ethernet segments.
Do switches have routing tables?
A switch maintains a table of MAC addresses (MAC Address table or CAM Table) and what physical switch port they are connected to. A Router maintains a table called Routing Table and uses the routing table to determine the route to the destination network.
Does switch have IP address?
Unmanaged and layer 2 network switches do not have an IP address, whereas managed switches and layer 3 switches do. A network switch with an IP address is required for Telnet which allows remote access to the switch. The IP address of a switch can be found via the router or an IP scanner.
Are hosts aware of switches?
Well, not quite. It’s true that a switch remembers which hosts are connected to which port (usually by observing the MAC addresses of the packets arriving on the ports). However a switch normally does not know about the “default route”, as that is a concept from a higher networking layer.
Where does the Ping on my router come from?
Source allows you to send a ping from any interface you want on the router. By default ping will source its ping from the closest match in the routing table. You may want to change the source-interface to verify proper routing.
Why is my switch not pinging my router?
You can’t ping because your devices are in different networks. Switch has a VLAN 1 SVI in network 192.168.10.0/24 and router is in 172.16.10.0/24 network. For switch to be able to reach a remote network (in which router resides) it needs to have a gateway that resides in its own network – 192.168.10.0/24.
How to set the size of the ping packet?
You can also use the size option to set the size of the ping packet. This is useful for a variety of reasons, but at the CCNA level, the best use is making sure the downstream routers can support abnormal MTUs (Maximum Transmission Unit). The MTU is the maximum size that a router will allow a packet to be for it to transmit..
What’s the default ping timeout on Cisco routers?
The default value of this timeout is two seconds on Cisco routers. For all the options about this command, see “Ping” under Troubleshooting Commands. The TTL value of a ping packet cannot be changed. Here is an output example showing the ping command after enabling the debug ip packet detail command: