4A0-100 Online Practice Questions and Answers

As described by the CSMA/CD algorithm, what is the first thing to happen when Host A and Host B begin transmitting data at the same time?

A. Host A and B will generate a jam signal.

B. Listening hosts will request retransmission.

C. Host A or B will retry the transmission.

D. A back-off timer is started by Host A or B.

Which of the following best describes an Ethernet bridge?

A. A passive device simply used to connect two or more cables. Does not generate or amplify any signals.

B. A device that receives and retransmits a signal out its other ports, but does not do any Layer 2 analysis of the data.

C. A device that receives a signal and based on the Layer 2 destination address, makes a decision on which ports the signal should be retransmitted.

D. A device that receives a signal and based on the Layer 3 destination address, makes a decision on which ports the signal should be retransmitted.

Which technologies can be used with Ethernet switches to achieve redundancy? (Choose two)

A. LAG

B. OSPF

C. RIP

D. STP

The method by which Ethernet frames are associated to a specific VLAN is referred to as:

A. Segmenting

B. Stacking

C. Routing

D. Tagging

What is the purpose of the Data Link Layer in the OSI model?

A. The Data Link Layer is responsible for encapsulating the packet into a frame for transmission on the transmission media.

B. The Data Link Layer is responsible for encapsulating the packet into an IP header and routing the packet.

C. The Data Link Layer is responsible for formatting the packet for applications such as JPEG format.

D. The Data Link Layer is responsible for timing of the signals on the transmission media

Given the following (Network address: 208.40.224.0, Network prefix: /28.) What is the address range, including the network and broadcast addresses, for the fourth sub-network?

A. 208.40.224.0 208.40.224.255

B. 208.40.4.0 208.40.4.255

C. 208.40.224.16 208.40.224.31

D. 208.40.224.48 208.40.224.63

E. 208.40.227.0 - 208.40.224.255

Choose two true statements that characterize Distance Vector Routing?

A. Routers send a copy of their routing table to their neighbors periodically.

B. Routers flood link information throughout the entire area.

C. Network converges quickly (within several seconds) after a topology change.

D. Routers do not have precise knowledge of the entire network topology.

Which of the parameters in Hello messages exchanged between two OSPF neighbors must be the same to keep the adjacency alive in OSPF? (Choose four.)

A. Interface MTU.

B. Area ID.

C. Authentication password.

D. Hello interval.

E. Dead interval.

F. Router priority.

Which of the following statements regarding TCP is TRUE?

A. Sequence numbers are used to ensure that the data received is offered to the application in the correct order.

B. The SYN flag is used to identify congestion in the network.

C. The NACK flag is set on confirmation segments to acknowledge FCS errors.

D. The window size is transmitted in all TCP segments to communicate MTU limitations of lower layer protocols to upper layer applications.

Which compact flash on a Control/Switch processor on a Nokia 7750 SR stores the runtime image and the running configuration?

A. SF 1

B. SF 2

C. SF 3

D. Both CF1 and CF2

A given network with address 200.12.30.0 and network mask 255.255.255.0 is divided into 16 equal-sized subnetworks. How many hosts does each subnetwork support?

A. 6

B. 14

C. 30

D. 62

Which of the following describes an IP filter on the Nokia 7750 SR?

A. An IP filter is used to discard packets with checksum errors.

B. An IP filter can allow IP packets into a network or deny IP packets from entering a network.

C. Multiple ingress and egress filter policies can be applied to a network interface.

D. Once an IP filter is applied, it cannot be modified.

Which of the following statements about router R3 is TRUE?

A. Router R3 is the iLER for LSP B.

B. Router R3 is the eLER for LSP A.

C. Router R is an LSR for both LSP A and LSP B.

D. Router R3 is LSR for LSP A and an LER for LSP B.

From the CE perspective, how does a VPWS operate?

A. Two sites are directly connected by a single cable.

B. Two sites are connected through a single switched LAN.

C. Two sites are connected through a public routed network.

D. Two sites are connected through a private routed network.

Which of the following is the location where an ISP aggregates its customer connections and connects them to the Internet?

A. A demarcation point

B. An Internet exchange point

C. A regional Internet registry

D. A point of presence