單項選擇題What is the purpose using the traceroute command?()

A. to map all the devices on a network.
B. to display the current TCP/IP configuration values.
C. to see how a device MAC address is mapped to its IP address.
D. to see the path a packet will take when traveling to a specified destination.
E. to display the MTU values for each router in a specified network path from source to a destination.


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1.單項選擇題Which type of attack is characterized by flood of packet that requesing a TCP connection to a server?()

A. denial of service
B. brute force
C. reconnaissance
D. Trojan horse

2.單項選擇題What is the default routing update period for RIPv2?()

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

3.單項選擇題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.

4.單項選擇題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

5.單項選擇題What is the maximum data rate specified for IEEE 802.11b WLANs?()

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