Which type of attack is characterized by flood of packet that requesing a TCP connection to a server?（）

单项选择题What is the default routing update period for RIPv2?（）

A. 15 seconds
B. 30 seconds
C. 180 seconds
D. 240 seconds

单项选择题An administrator issues the command ping 127.0.0.1 from the command line prompt on a PC. If a reply is received, what does this confirm?（）

A. The PC has connectivity with a local host.
B. The PC has connectivity with a Layer 3 device.
C. The PC has a default gateway correctly configured
D. The PC has connectivity up to Layer 5 of the OSI model
E. The PC has the TCP/IP protocol stack correctly installed.

单项选择题How does using the service password encryption command on a router provide additional security? （）

A. by encrypting all passwords passing through the router
B. by encrypting passwords in the plain text configuration file
C. by requiring entry of encrypted passwords for access to the device
D. by configuring an MD5 encrypted key to be used by routing protocols to validate routing exchanges
E. by automatically suggesting encrypted passwords for use in configuring the router

单项选择题What is the maximum data rate specified for IEEE 802.11b WLANs?（）

A. 10 Mbps
B. 11 Mbps
C. 54 Mbps
D. 100 Mbps

单项选择题Which protocol should be used to establish a secure terminal connection to a remote network device? Select the best response.（）

A. ARP
B. SSH
C. Telnet
D. WEP
E. SNMPv1
F. SNMPv2