Hi,
You cannot use IP 192.168.1.128 with a /30 mask, as it is the subnet address. with a /30 mask you only get 2 host addresses, however you also have a subnet and broadcast address, see the following breakdown.
192.168.1.128 - subnet address
192.168.1.129 - 1st host address
192.168.1.130 -...
To pass this test, I used both the certification guide and the self study guide as both contain different information. The IPsec chapter in the self-study is over a 100 pages long and about 20 in the certification guide. I would also recommend reading up on pppoa and pppoe on the Cisco...
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