多项选择题Which of the following technologies can be used in distance vector routing protocols to prevent routing loops?()

A. Spanning Tree Protocol
B. Shortest path first tree
C. Link-state advertisements (LSA)
D. Hold-down timers
E. Split horizon
F. VRP


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3.多项选择题Part of the job as a network administrator is being able to make a distinction between routed protocols and routing protocols. Which of the following statements is true regarding them?()

A. A routing protocol is assigned to an interface and determines the method of packet delivery.
B. A routed protocol is assigned to an interface and determines the method of packet delivery.
C. A routing protocol determines the path of a packet through a network.
D. A routed protocol determines the path of a packet through a network.
E. A routing protocol operates at the transport layer of the OSI model.
F. A routed protocol updates the routing table of a router.

4.单项选择题What does a Layer 2 switch use to decide where to forward a received frame?()

A. source MAC address
B. source IP address
C. source switch port
D. destination IP address
E. destination port address
F. destination MAC address

5.单项选择题What does a Layer 2 switch do if it receives a frame with a destination MAC address that is not found in its MAC address table?()

A. The frame is dropped.
B. The frame is addressed with a broadcast MAC address and sent out all ports.
C. The frame is sent out all ports except the receiving port.
D. An ARP request is sent out all ports except the receiving port.
E. A destination unreachable message is sent back to the source address.
F. None of the above.

6.多项选择题With regard to Ethernet media access methods, which of the following are true?()

A. A device waits for an electronic signal before transmitting.
B. A device listens and waits until the media is not busy before transmitting.
C. All devices on an Ethernet segment see data that passes on the network medium.
D. Only the sender and the receiver devices see data that passes on the network medium.
E. Ethernet networks allow you to configured devises with higher transmission priority.

7.单项选择题Which of the following are true of Ethernet technology?()

A. Hosts use a logical ring topology.
B. Hosts use a logical bus topology
C. Hosts must wait for an electronic signal to transfer data.
D. Hosts are directly connected to a wiring concentrator called a MSAU.

8.多项选择题Two stations on a LAN transmit at the same time, resulting in a collision. What happens when a collision occurs on the network?()

A. Each device on the Ethernet segment stops transmitting for a short time.
B. A jam signal informs all devices that a collision occurred.
C. When data transmission resumes, the devices that were involved in the collision have priority to transmit.
D. The devices that are involved in the collision stops transmitting for a short time.
E. The collision invokes a random back-off algorithm.

9.单项选择题Which of the addresses below is an example of a valid unicast address?()

A.172.31.128.255./18
B.255.255.255.255
C.192.168.24.59/30
D.224.0.0.5
E.All of the above

10.单项选择题Which one of the protocols below allows a router to respond to an ARP request destined to a remote host?()

A. Gateway DP
B. Reverse ARP
C. proxy ARP
D. Inverse ARP
E. indirect ARP