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2021 Aug ccent 100-101 book:

Q101. What OSPF command, when configured, will include all interfaces into area 0? 

A. network 0.0.0.0 255.255.255.255 area 0 

B. network 0.0.0.0 0.0.0.0 area 0 

C. network 255.255.255.255 0.0.0.0 area 0 

D. network all-interfaces area 0 

Answer: A 


Q102. Which OSI layer header contains the address of a destination host that is on another network? 

A. application 

B. session 

C. transport 

D. network 

E. data link 

F. physical 

Answer: D 


Q103. Refer to the exhibit. 


A technician is troubleshooting a host connectivity problem. The host is unable to ping a server connected to Switch_A. Based on the results of the testing, what could be the problem? 

A. A remote physical layer problem exists. 

B. The host NIC is not functioning. 

C. TCP/IP has not been correctly installed on the host. 

D. A local physical layer problem exists. 

Answer: D 


Q104. Given a Class C IP address subnetted with a /30 subnet mask, how many valid host IP addresses are available on each of the subnets? 

A. 1 

B. 2 

C. 4 

D. 8 

E. 252 

F. 254 

Answer: B 


Q105. Refer to the exhibit. 


The network administrator is testing connectivity from the branch router to the newly installed application server. What is the most likely reason for the first ping having a success rate of only 60 percent? 

A. The network is likely to be congested, with the result that packets are being intermittently dropped. 

B. The branch router had to resolve the application server MAC address. 

C. There is a short delay while NAT translates the server IP address. 

D. A routing table lookup delayed forwarding on the first two ping packets. 

E. The branch router LAN interface should be upgraded to FastEthernet. 

Answer: B 


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Q106. After the network has converged, what type of messaging, if any, occurs between R3 and R4? 


A. No messages are exchanged 

B. Hellos are sent every 10 seconds. 

C. The full database from each router is sent every 30 seconds. 

D. The routing table from each router is sent every 60 seconds. 

Answer: B 


Q107. Which option is a valid IPv6 address? 

A. 2001:0000:130F::099a::12a 

B. 2002:7654:A1AD:61:81AF:CCC1 

C. FEC0:ABCD:WXYZ:0067::2A4 

D. 2004:1:25A4:886F::1 

Answer: D 


Q108. Refer to the exhibit. 


The two connected ports on the switch are not turning orange or green. What would be the most effective steps to troubleshoot this physical layer problem? (Choose three.) 

A. Ensure that the Ethernet encapsulations match on the interconnected router and switch ports. 

B. Ensure that cables A and B are straight-through cables. 

C. Ensure cable A is plugged into a trunk port. 

D. Ensure the switch has power. 

E. Reboot all of the devices. 

F. Reseat all cables. 

Answer: BDF 


Q109. Which layer of the OSI model controls the reliability of communications between network devices using flow control, sequencing and acknowledgments? 

A. Physical 

B. Data-link 

C. Transport 

D. Network 

Answer: C 


Q110. Refer to the exhibit. 


The DHCP settings have recently been changed on the DHCP server and the client is no longer able to reach network resources. What should be done to correct this situation? 

A. Verify that the DNS server address is correct in the DHCP pool. 

B. Ping the default gateway to populate the ARP cache. 

C. Use the tracert command on the DHCP client to first determine where the problem is located. 

D. Clear all DHCP leases on the router to prevent address conflicts. 

E. Issue the ipconfig command with the /release and /renew options in a command window. 

Answer: E