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 sessions exist between Host A and Host B?（）

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 host is attempting to send data to another host on a different network. What is the first action that the sending host will take?（）

Host A opens a Telnet connection to Host B. Host A then opens another Telnet connectionto Host B. These connections are the only communication between Host A and Host B. Thesecurity policy configuration permits both connections.How many flows exist between Host A and Host B？（）

Which destination addresses will be used by Host A to send data to Host C?（）

Which destination addresses will be used by Host A to send data to Host C?（）

When a host transmits data across a network to another host, which process does the data go through?（）

（ ）estimating is a technique for estimating the duration or cost of an activity ou project using historical data from a similar activity or project.

rogram propagates itself by modifying other programs to include a possibly changed copy of itself and that is executed when the infected program is(67). A virus often causes damage or annoyance and may be triggered by some event such as the occurrence of a predetermined date.Worm is a self-contained program that can propagate itself through data processing systems or computer networks. Worms are often designed by hackers to use up(68) resources such as storage space or processing time.Trojan horse implies by the name an apparently harmless program containing(69) logic that allows the unauthorized collection, falsification or destruction of data. Logic bomb causes damage to a data processing system when triggered by some specific system condition. Time bomb is also a malicious program being activated at a(70) time.

Which option provides a hierarchy of data security across lines of business?（）

A current moving across a lock entrance toward the river or toward the dam is called a(n)（）.

The data station usually means a(71)unit that provides data for transmission, that accepts transmitted data, and that performs all functions necessary for communication with another functional unit. Data stations may be divided into two kinds, the primary stations and the secondary stations, (72)control functions.In(73)data link control, the primary station is the data station that supports the primary control functions of the data link, generates commands to be transmitted, and interprets received responses. Specific responsibilities assigned to the primary station include initialization of control signal interchange, organization of data flow and actions regarding error control and error recovery functions. The secondary station executes data link control functions as (74)by the primary station, interprets received commands and (75) responses to be transmitted.