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Refer to the exhibit. For management purposes, Switch _SW1 needs to be remotely accessed by Host 1 using Telnet. For some reason the Telnet session cannot be established. What must be updated in the configuration of Switch _SW1 to solve this problem?
Add the subnet mask 255.255.255.224 to the ip default-gateway command.
2 problems on SW1: gateway is in the wrong subnet, and there is no password+login configured for the first 5 vty lines
Add the command ip route 0.0.0.0 0.0.0.0 192.168.100.126
Modify the _ip default-gateway to 192.168.100.158
Modify the interface information to Fastethernet 1/0.
(1) In the scenario above the IP default-gateway is in the wrong subnet. If the interface VLAN1 is configured within the address of 192.168.100.157 with the subnet mask /27 then the default gateway must also be in the same subnet (192.168.100.128-159). The command: "ip default-gateway"; doesn't require, or even permit a configured subnet-mask because it "assumes" that it belongs to the same network, and doesn't make any checks/ - - - - - - - - - - - -(2) When you telnet/ssh into a cisco device, it connects to the first vty line available, which will be: "vty line 0" if there aren't any other existing remote access sessions already. Looking at the running-config, there is "nothing" set on vty-lines 0-4, and without a password, or the "no login" command, the system won't allow you to access a remote-access-session. (when I attempt this packettracer. instead of getting: "Password required, none set"; I get "connection closed by foreign host" which is the message we used to get if you didn't have the "login" option configured. A while back, they mostly stopped requiring the "login" option to be configured, and it went past that issue by default. - - - - - - - - (2a) "IF" you attempted to telnet to SW1 with this config, -AND-IF, there were already 5 remote-sessions established, then you would get prompted for the password='cisco', BUT, since there is no configuration for those first 5 lines, we wouldn't be able to have 5 sessions connect by ANY method that would use vty-lines (unless the config was changed 'after' they successfully logged-on, because deleting the options for 'line vty 0 5" would block future connection, but it wouldn't disconnect existing ones. - - - -> 'SOME' admins set a different password on the last-vty-line in order to ensure that other people can't take up all the sessions, and that they will always be able to connect to the last vty-line with that 'special" password if all the others are taken.
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