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Q21. A network administrator is creating a subnet plan for the address 172.16.0.0/16. The network must support 459 hosts on each subnet while providing the maximum number of subnets. What subnet mask should be used? 

A. 255.255.0.0 

B. 255.255.128.0 

C. 255.255.224.0 

D. 255.255.254.0 

Answer: D 


Q22. What ICMP message type will a router use to indicate to a host that an IP datagram sourced from that host cannot be delivered? 

A. Echo Request. 

B. Destination Unreachable. 

C. Router redirect. 

D. Echo Reply. 

Answer: B 


Q23. What problems was Spanning Tree Protocol (STP) primarily designed to solve? (Choose two): 

A. Providing path redundancy. 

B. Preventing loops. 

C. Handling collisions. 

D. Allowing flooding of multicast traffic. 

Answer: A,B 


Q24. Which of the following best describes the function of an ARP cache within the same subnet? 

A. Used by IP to map an unknown IP address to the known hardware address of the distant host. 

B. Adds only an IP address entry for an unknown device on the same subnet. 

C. Transmits ICMP messages to multiple hosts with unknown IP addresses. 

D. Resolves the MAC address of a host device given its IP address. 

Answer: D 


Q25. Multiple SAPs may be defined on the same physical port and may be used for different services. 

A. True 

B. False 

Answer: A 


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Q26. What is the purpose of the source and destination ports in the TCP header? 

A. These ports identify the physical location of the sender and the receiver on the IP router. 

B. These ports are used as addresses to communicate with the IP layer. 

C. TCP does not use source or destination ports. 

D. These ports are used as an address to identify the upper layer application using the TCP connection. 

Answer: D 


Q27. Which bit pattern identifies the network address in the subnet mask? 

A. A string of consecutive 1's. 

B. A string of consecutive0's. 

C. A string of alternating 10's. 

D. The network address is determined by masking the source address with a port's ifIndex binary representation. 

Answer: A 


Q28. Which of the following is true of Ethernet half-duplex transmission? 

A. Half-duplex transmission is less efficient because the frame MTU is smaller. 

B. Half-duplex transmission is only 30-40% efficient because of collisions. 

C. Ethernet switches support half-duplex transmission only. 

D. All of the above. 

Answer: B 


Q29. Which of the following are TRUE statements about the router ID in OSPF? Choose two 

A. A router ID is not required by OSPF. 

B. The system address is used as the router ID if router-id is not set. 

C. The router ID is used to uniquely identify every OSPF router. 

D. On the Alcatel-Lucent 7750 SR, the router ID is set to the highest logical IP address if router-id is not explicitly set. 

Answer: B,C 


Q30. A 24 port Ethernet switch is configured with VLAN 100 on ports 1 - 8, VLAN 200 on ports 9 

-

16 and VLAN 300 on ports 17 - 24. Which of the following describes the behavior of the switch when a broadcast frame is received on port 1? 

A. 

The switch will discard the broadcast frame because there is no specific destination address. 

B. 

The switch will flood the broadcast frame on all ports on which the switch has seen frames from attached devices 

C. 

The switch will flood the broadcast frame on ports 2 to 8. 

D. 

The switch will flood the broadcast frame on all 24 ports. 

Answer: C