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? （）

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.

多项选择题Which two are characteristics of link-state routing protocols?（） (Choose two.)

A. Routers choose a best path for a destination based on the SPF algorithm.
B. All routers in a given area or level build a consistent database describing the network's topology.
C. Routers choose the best path for a destination based on the interface on which they received the link stateadvertisement with the lowest cost.
D. All routers in a given area or level forward link state advertisements between interfaces in the same area or level, adding their metric to the link state advertisement's cost information when they forward it.