Can anyone explain why Phase 1 is bidirectional and Phase 2 is unidirectional in IPSEC VPN. I read in one book that Phase 1 uses shared symmetric key generated by DH and both peers uses same key hence it is bidirectional. so in phase 2, are we using ...

Hello mates,Is there any network simulator which is available on any site or like we can make topology through web site and can see the ouput of every device ??Kind of like online network simulator like how web mail is there. ??please let me know.

Hello,if a PC-1 is connected to switchport(hostname of switch - switch 1 ) of vlan2 and suppose switch 1 is connected to switch 2 with trunk port.Now,i know that PC cannnot understand vlan but when PC-1 sends a packet to switch 2 of any host(for eg. ...