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Q1. - (Topic 4) 

The ip helper-address command does what? 

A. assigns an IP address to a host 

B. resolves an IP address from a DNS server 

C. relays a DHCP request across networks 

D. resolves an IP address overlapping issue 

Answer:

Explanation: 

http://cisconet.com/tcpip/dhcp/107-how-to-use-ip-helper-address-to-connect-remote-dhcp-

server.html 

When the DHCP client sends the DHCP request packet, it doesn’t have an IP address. So it uses the all-zeroes address, 0.0.0.0, as the IP source address. And it doesn’t know how to reach the DHCP server, so it uses a general broadcast address, 255.255.255.255, for the destination. So the router must replace the source address with its own IP address, for the interface that received the request. And it replaces the destination address with the address specified in the ip helper-address command. The client device’s MAC address is included in the payload of the original DHCP request packet, so the router doesn’t need to do anything to ensure that the server receives this information. The router then relays the DHCP request to the DHCP server. 


Q2. - (Topic 7) 

Which NAT type is used to translate a single inside address to a single outside address? 

A. dynamic NAT 

B. NAT overload 

C. PAT 

D. static NAT 

Answer:

Explanation: 

Network address translation (NAT) is the process of modifying IP address information in 

IP packet headers while in transit across a traffic routing device. 

There are two different types of NAT: . NAT . PAT 


Q3. - (Topic 5) 

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:

Explanation: 

A PC will retain its DHCP assigned IP address until the lease time expires, which often times is 24 hours or more. When changes are made to the DHCP server, the client should issue the ipconfig/release and then ipconfig/renew commands to obtain a new IP address lease. 


Q4. - (Topic 3) 

Which command enables IPv6 forwarding on a Cisco router? 

A. ipv6 host 

B. ipv6 unicast-routing 

C. ipv6 local 

D. ipv6 neighbor 

Answer:

Explanation: 

Enabling IPv6 on Cisco IOS Software Technology http://www.ciscopress.com/articles/article.asp?p=31948&seqNum=4 The first step of enabling IPv6 on a Cisco router is the activation of IPv6 traffic forwarding to forward unicast IPv6 packets between network interfaces. By default, IPv6 traffic forwarding is disabled on Cisco routers. The ipv6 unicast-routing command is used to enable the forwarding of IPv6 packets between interfaces on the router. The syntax for this command is as follows: Router(config)#ipv6 unicast-routing The ipv6 unicast-routing command is enabled on a global basis. 


Q5. - (Topic 5) 

Why would a network administrator configure port security on a switch? 

A. to prevent unauthorized Telnet access to a switch port 

B. to prevent unauthorized hosts from accessing the LAN 

C. to limit the number of Layer 2 broadcasts on a particular switch port 

D. block unauthorized access to the switch management interfaces 

Answer:

Explanation: 

You can use the port security feature to restrict input to an interface by limiting and identifying MAC addresses of the stations allowed to access the port. When you assign secure MAC addresses to a secure port, the port does not forward packets with source addresses outside the group of defined addresses. If you limit the number of secure MAC addresses to one and assign a single secure MAC address, the workstation attached to that port is assured the full bandwidth of the port. If a port is configured as a secure port and the maximum number of secure MAC addresses is reached, when the MAC address of a station attempting to access the port is different from any of the identified secure MAC addresses, a security violation occurs. Also, if a station with a secure MAC address configured or learned on one secure port attempts to access another secure port, a violation is flagged. 


Q6. - (Topic 3) 

Which parameter or parameters are used to calculate OSPF cost in Cisco routers? 

A. Bandwidth 

B. Bandwidth and Delay 

C. Bandwidth, Delay, and MTU 

D. Bandwidth, MTU, Reliability, Delay, and Load 

Answer:

Explanation: 

The well-known formula to calculate OSPF cost is Cost = 108/ Bandwidth 


Q7. - (Topic 5) 

Refer to the exhibit. 

A network administrator has configured a Catalyst 2950 switch for remote management by pasting into the console the configuration commands that are shown in the exhibit. However, a Telnet session cannot be successfully established from a remote host. What should be done to fix this problem? 

A. Change the first line to interface fastethernet 0/1. 

B. Change the first line to interface vlan 0/1. 

C. Change the fifth line to ip default-gateway 192.168.17.241. 

D. Change the fifth line to ip route 0.0.0.0 0.0.0.0 192.168.17.1. 

E. Change the sixth line to line con 0. 

Answer:

Explanation: 

The default gateway must reside on the same IP subnet as the device. Here, the subnet mask for the VLAN interface is /228. Only choice C will fix this issue, as then the default gateway is on the same subnet as the 2950. 


Q8. - (Topic 4) 

Refer to the exhibit. 

A company wants to use NAT in the network shown. Which commands will apply the NAT configuration to the proper interfaces? (Choose two.) 

A. R1(config)# interface serial0/1 R1(config-if)# ip nat inside 

B. R1(config)# interface serial0/1 R1(config-if)# ip nat outside 

C. R1(config)# interface fastethernet0/0 R1(config-if)# ip nat inside 

D. R1(config)# interface fastethernet0/0 R1(config-if)# ip nat outside 

E. R1(config)# interface serial0/1 R1(config-if)# ip nat outside source pool 200.2.2.18 255.255.255.252 

F. R1(config)# interface fastethernet0/0 R1(config-if)# ip nat inside source 10.10.0.0 255.255.255.0 

Answer: B,C 

Explanation: 

For NAT, you need to define which interfaces are inside and which are outside. The outside interface is the one that connects to the external network, and the one that will be used for translating addresses. The inside interface is for the internal network, and defines the network IP addresses that will get translated to the one specified in the outside network. 


Q9. - (Topic 3) 

ROUTER# show ip route 

192.168.12.0/24 is variably subnetted, 9 subnets, 3 masks C 192.168.12.64 /28 is directly connected, Loopback1 C 192.168.12.32 /28 is directly connected, Ethernet0 C 192.168.12.48 /28 is directly connected, Loopback0 O 192.168.12.236 /30 [110/128] via 192.168.12.233, 00:35:36, Serial0 C 192.168.12.232 /30 is directly connected, Serial0 O 192.168.12.245 /30 [110/782] via 192.168.12.233, 00:35:36, Serial0 O 192.168.12.240 /30 [110/128] via 192.168.12.233, 00:35:36, Serial0 O 192.168.12.253 /30 [110/782] via 192.168.12.233, 00:35:37, Serial0 O 192.168.12.249 /30 [110/782] via 192.168.12.233, 00:35:37, Serial0 O 192.168.12.240/30 [110/128] via 192.168.12.233, 00:35:36, Serial 0 

To what does the 128 refer to in the router output above? 

A. OSPF cost 

B. OSPF priority 

C. OSPF hop count 

D. OSPF ID number 

E. OSPF administrative distance 

Answer:

Explanation: 

The first parameter is the Administrative Distance of OSPF (110) while the second parameter is the cost of OSPF. 


Q10. - (Topic 3) 

An administrator is in the process of changing the configuration of a router. What command will allow the administrator to check the changes that have been made prior to saving the new configuration? 

A. Router# show startup-config 

B. Router# show current-config 

C. Router# show running-config 

D. Router# show memory 

E. Router# show flash 

F. Router# show processes 

Answer:

Explanation: 

This command followed by the appropriate parameter will show the running config hence the admin will be able to see what changes have been made, and then they can be saved.