多项选择题

Which two statements regarding asymmetric key encryption are true?（） (Choose two.)

A. The same key is used for encryption and decryption.
B. It is commonly used to create digital certificate signatures.
C. It uses two keys: one for encryption and a different key for decryption.
D. An attacker can decrypt data if the attacker captures the key used for encryption.

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单项选择题Host A opens a Telnet connection to Host B. Host A then opens another Telnet connection to Host B. These connections are the only communication between Host A and Host B. The security policy configuration permits both connections. How many flows exist between Host A and Host B? （）

A.1
B.2
C.3
D.4

单项选择题Using a policy with the policy-rematch flag enabled, what happens to the existing and new sessionswhen you change the policy action from permit to deny? （）

A. The new sessions matching the policy are denied. The existing sessions are dropped.
B. The new sessions matching the policy are denied. The existing sessions, not being allowed to carry any traffic, simply timeout.
C. The new sessions matching the policy might be allowed through if they match another policy. The existing sessions are dropped.
D. The new sessions matching the policy are denied. The existing sessions continue until they are completed or their timeout is reached.

多项选择题In JUNOS software with enhanced services, which three packet elements are inspected to determineif a session already exists? （）(Choose three.)

A. IP protocol
B. IP time-to-live
C. source and destination IP address
D. source and destination MAC address
E. source and destination TCP/UDP port

单项选择题You want to create a policy allowing traffic from any host in the Trust zone to hostb.example.com(172.19.1.1) in theUntrust zone. How do you do create this policy? （）

A. Specify the IP address (172.19.1.1/32) as the destination address in the policy.
B. Specify the DNS entry (hostb.example.com.) as the destination address in the policy.
C. Create an address book entry in the Trust zone for the 172.19.1.1/32 prefix and reference this entry in the policy.
D. Create an address book entry in the Untrust zone for the 172.19.1.1/32 prefix and reference this entry in the policy.

多项选择题Click the Exhibit button. host_a is in subnet_a and host_b is in subnet_b. Given the configuration shown in the exhibit, which statement is true about traffic from host_a to host_b?（）

A. DNS traffic is denied.
B. Telnet traffic is denied.
C. SMTP traffic is denied.
D. Ping traffic is permitted.