多項選擇題Which two features did WPAv1 add to address the inherent weaknesses found in WEP?（）

A. a stronger encryption algorithm
B. key mixing using temporal keys
C. shared key authentication
D. a shorter initialization vector
E. per frame sequence counters


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1.多項選擇題Which three options are valid WAN connectivity methods?（）

A.PPP
B.WAP
C.HDLC
D.MPLS
E.L2TPv3
F.ATM

2.多項選擇題If IP routing is enabled, which two commands set the gateway of last resort to the default gateway?（）

A. ip default-gateway 0.0.0.0
B. ip route 172.16.2.1 0.0.0.0 0.0.0.0
C. ip default-network 0.0.0.0
D. ip default-route 0.0.0.0 0.0.0.0 172.16.2.1
E. ip route 0.0.0.0 0.0.0.0 172.16.2.1

3.多項選擇題Workstation A has been assigned an IP address of 192.0.2.24/28. Workstation B has been assigned an IP address of 192.0.2.100/28. The two workstations are connected with a straight-through cable. Attempts to ping between the hosts are unsuccessful. What two things can be done to allow communications between the hosts? （）

A. Replace the straight-through cable with a crossover cable.
B. Change the subnet mask of the hosts to /25.
C. Change the subnet mask of the hosts to /26.
D. Change the address of Workstation A to 192.0.2.15.
E. Change the address of Workstation B to 192.0.2.111.

4.多項選擇題Which two addresses can be assigned to a host with a subnet mask of 255.255.254.0？（）

A.113.10.4.0
B.186.54.3.0
C.175.33.3.255
D.26.35.2.255
E.17.35.36.0

5.單項選擇題The network default gateway applying to a host by DHCP is 192.168.5.33/28.Which option is the valid IP address of this host？（）

A.192.168.5.55
B.192.168.5.47
C.192.168.5.40
D.192.168.5.32
E.192.168.5.14