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Q1. - (Topic 2) 

A switch has 48 ports and 4 VLANs. How many collision and broadcast domains exist on the switch (collision, broadcast)? 

A. 4, 48 

B. 48, 4 

C. 48, 1 

D. 1, 48 

E. 4, 1 

Answer:

Explanation: 

A switch uses a separate collision domain for each port, and each VLAN is a separate broadcast domain. 

Topic 3, Routing Fundamentals 


Q2. - (Topic 1) 

Refer to the exhibit. 

The exhibit is showing the topology and the MAC address table. Host A sends a data frame to host D. What will the switch do when it receives the frame from host A? 

A. The switch will add the source address and port to the MAC address table and forward the frame to host D. 

B. The switch will discard the frame and send an error message back to host A. 

C. The switch will flood the frame out of all ports except for port Fa0/3. 

D. The switch will add the destination address of the frame to the MAC address table and forward the frame to host D. 

Answer:

Explanation: 

When switch receives the data frame from the host not having the MAC address already on the MAC table, it will add the MAC address to source port on MAC address table and sends the data frame. 


Q3. - (Topic 3) 

Refer to the exhibit. 

If the router Cisco returns the given output and has not had its router ID set manually, what value will OSPF use as its router ID? 

A. 192.168.1.1 

B. 172.16.1.1 

C. 1.1.1.1 

D. 2.2.2.2 

Answer:

Explanation: 

If a router-id is not configured manually in the OSPF routing process the router will automatically configure a router-id determined from the highest IP address of a logical interface (loopback interface) or the highest IP address of an active interface. If more than one loopback interfaces are configured, the router will compare the IP addresses of each of the interfaces and choose the highest IP address from the loopbacks. 


Q4. - (Topic 1) 

On a Cisco switch, which protocol determines if an attached VoIP phone is from Cisco or from another vendor? 

A. RTP 

B. TCP 

C. CDP 

D. UDP 

Answer:

Explanation: 

The Cisco Unified IP Phone uses CDP to communicate information such as auxiliary VLAN ID, per port power management details, and Quality of Service (QoS) configuration information with the Cisco Catalyst switch. Cisco Discovery Protocol (CDP) is a proprietary protocol designed by Cisco to help administrators collect information about both locally attached and remote devices. By using CDP, you can gather hardware and protocol information about neighbor devices, which is useful info for troubleshooting the network. CDP messages are generated every 60 seconds as multicast messages on each of its active interfaces. The information shared in a CDP packet about a Cisco device includes the following: Name of the device configured with the hostname command IOS software version Hardware capabilities, such as routing, switching, and/or bridging Hardware platform, such as 2600, 2950, or 1900 The layer-3 address(es) of the device The interface the CDP update was generated on 

Reference: http://computernetworkingnotes.com/cisco-devices-administration-and-configuration/cisco-discoveryprotocol.html 


Q5. - (Topic 3) 

Given an IP address of 192.168.1.42 255.255.255.248, what is the subnet address? 

A. 192.168.1.8/29 

B. 192.168.1.32/27 

C. 192.168.1.40/29 

D. 192.168.1.16/28 

E. 192.168.1.48/29 

Answer:

Explanation: 

248 mask uses 5 bits (1111 1000) 

42 IP in binary is (0010 1010) 

The base subnet therefore is the lowest binary value that can be written without changing 

the output of an AND operation of the subnet mask and IP... 

1111 1000 AND 

0010 1010 equals 

0010 1000 - which is .40 

/24 is standard class C mask. 

Adding the 5 bits from the .248 mask gives /29 


Q6. - (Topic 2) 

A switch receives a frame on one of its ports. There is no entry in the MAC address table for the destination MAC address. What will the switch do with the frame? 

A. drop the frame 

B. forward it out of all ports except the one that received it 

C. forward it out of all ports 

D. store it until it learns the correct port 

Answer:

Explanation: 

Understanding this concept is prime for understanding that when switch receives the data frame from the host not having the MAC address already in the MAC table, it will add the MAC address to the source port on the MAC address table and sends the data frame. If the switch already has the MAC address in its table for the destination, it will forward the frame directly to the destination port. If it was not already in its MAC table, then they frame would have been flooded out all ports except for the port that it came from. 


Q7. - (Topic 4) 

What is the best practice when assigning IP addresses in a small office of six hosts? 

A. Use a DHCP server that is located at the headquarters. 

B. Use a DHCP server that is located at the branch office. 

C. Assign the addresses by using the local CDP protocol. 

D. Assign the addresses statically on each node. 

Answer:

Explanation: 

Its best to use static addressing scheme where the number of systems is manageable rather than using a dynamic method such as DHCP as it is easy to operate and manage. 


Q8. - (Topic 3) 

What command sequence will configure a router to run OSPF and add network 10.1.1.0 /24 to area 0? 

A. router ospf area 0 network 10.1.1.0 255.255.255.0 area 0 

B. router ospf network 10.1.1.0 0.0.0.255 

C. router ospf 1 network 10.1.1.0 0.0.0.255 area 0 

D. router ospf area 0 network 10.1.1.0 0.0.0.255 area 0 

E. router ospf network 10.1.1.0 255.255.255.0 area 0 F. router ospf 1 network 10.1.1.0 0.0.0.255 

Answer:

Explanation: 

Enabling OSPFSUMMARY STEPS 

1. 

enable 

2. 

configure terminal 

3. 

router ospf process-id 

4. 

network ip-address wildcard-mask area area-id 

5. 

end 

DETAILED STEPS 

Command or Action Purpose Step.1 enable 

Example: 

Device> enable Enables privileged EXEC mode. . Enter your password if prompted. 

Step.2 configure terminal 

Example: 

Device# configure terminal Enters global configuration mode. 

Step.3 router ospf process-id 

Example: 

Device(config)# router ospf 109 

Enables OSPF routing and enters router configuration mode. 

Step.4 network ip-address wildcard-mask area area-id 

Example: 

Device(config-router)# network 192.168.129.16 0.0.0.3 area 0 

Defines an interface on which OSPF runs and defines the area ID for that interface. 

Step.5 end 

Example: 

Device(config-router)# end 

Exits router configuration mode and returns to privileged EXEC mode. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/12-4t/iro-12-4t-book/iro-cfg.html#GUID-588D1301-F63C-4DAC-BF1C-C3735EB13673 


Q9. - (Topic 1) 

Which statements accurately describe CDP? (Choose three.) 

A. CDP is an IEEE standard protocol. 

B. CDP is a Cisco proprietary protocol. 

C. CDP is a datalink layer protocol. 

D. CDP is a network layer protocol. 

E. CDP can discover directly connected neighboring Cisco devices. 

F. CDP can discover Cisco devices that are not directly connected. 

Answer: B,C,E 

Explanation: 

CDP (Cisco Discovery Protocol) is a proprietary protocol designed by Cisco to help administrators collect information about both locally attached and remote devices. By using CDP, you can gather hardware and protocol information about neighbor devices containing useful info for troubleshooting and documenting the network. 


Q10. - (Topic 3) 

Scenario 

Refer to the topology. Your company has decided to connect the main office with three other remote branch offices using point-to-point serial links. 

You are required to troubleshoot and resolve OSPF neighbor adjacency issues between the main office and the routers located in the remote branch offices. 

An OSPF neighbor adjacency is not formed between R3 in the main office and R5 in the Branch2 office. What is causing the problem? 

A. There is an area ID mismatch. 

B. There is a PPP authentication issue; a password mismatch. 

C. There is an OSPF hello and dead interval mismatch. 

D. There is a missing network command in the OSPF process on R5. 

Answer:

Explanation: 

The “show ip ospf interface command on R3 and R5 shows that the hello and dead intervals do not match. They are 50 and 200 on R3 and 10 and 40 on R5. 

Topic 4, Infrastructure Services