問答題網(wǎng)絡(luò)安全涉及到OSI哪幾層?

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2.單項(xiàng)選擇題Which of the following describes the appropriate port assignment and message exchange in a standard TFTP transaction?()

A.Server: 10.0.0.1:69 RRQ/WRQ Sent;Client: 10.0.0.2:1888 RRQ/WRQ Received
B.Server: 10.0.0.1:1888 RRQ/WRQ Received;Client: 10.0.0.2:69 RRQ/WRQ Received
C.Server: 10.0.0.1:69 RRQ/WRQ Received;Client: 10.0.0.2:69 RRQ/WRQ Sent
D.Server: 10.0.0.1:69 RRQ/WRQ Received;Client: 10.0.0.2:1888 RRQ/WRQ Sent
E.Server: 10.0.0.1:1888 RRQ/WRQ Sent;Client: 10.0.0.2:69 RRQ/WRQ Sent
F.Server: 10.0.0.1:1888 RRQ/WRQ Received;Client: 10.0.0.2:69 RRQ/WRQ Sent

5.單項(xiàng)選擇題Customer X has a hub-and-spoke Frame Relay network, with a central office and two branch offices(RemoteA and RemoteB). Each location has only one physical link to the Frame Relay cloud and RemoteB has a router that is not a Cisco router. Since the installation,there is no connectivity between RemoteB and the central office. What is a possible solution to this issue?()

A.Because Frame Relay IETF encapsulation is only configurable at interface level, you must use IETF encapsulation on all routers.
B.This is not a possible scenario. A dedicated Frame Relay link to RemoteB is mandatory at the central office.
C.The router at RemoteB must be replaced by a Cisco router.
D.Use Frame Relay IETF encapsulation on a per-VC basis on the central office router.
E.There is a problem in the Frame Relay cloud, because Cisco routers are compatible with IETF Frame Relay.