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Q21. - (Topic 7) 

Which statement about a router on a stick is true? 

A. Its date plane router traffic for a single VI AN over two or more switches. 

B. It uses multiple subinterfaces of a single interface to encapsulate traffic for different VLANs on the same subnet. 

C. It requires the native VLAN to be disabled. 

D. It uses multiple subinterfaces of a single interface to encapsulate traffic for different VLANs. 

Answer:

Explanation: 

https://www.freeccnaworkbook.com/workbooks/ccna/configuring-inter-vlan-routing-router-on-a-stick 


Q22. - (Topic 7) 

Which statement about routing protocols is true? 

A. Link-state routing protocols choose a path by the number of hops to the destination. 

B. OSPF is a link-state routing protocol. 

C. Distance-vector routing protocols use the Shortest Path First algorithm. 

D. IS-IS is a distance-vector routing protocol. 

Answer:

Explanation: Link State Routing Protocols 

Link state protocols are also called shortest-path-first protocols. Link state routing protocols have a complete picture of the network topology. Hence they know more about the whole network than any distance vector protocol. Three separate tables are created on each link state routing enabled router. One table is used to hold details about directly connected neighbors, one is used to hold the topology of the entire internetwork and the last one is used to hold the actual routing table. Link state protocols send information about directly connected links to all the routers in the network. Examples of Link state routing protocols include OSPF - Open Shortest Path First and IS-IS - Intermediate System to Intermediate System. There are also routing protocols that are considered to be hybrid in the sense that they use aspects of both distance vector and link state protocols. EIGRP - Enhanced Interior Gateway Routing Protocol is one of those hybrid routing protocols. 


Q23. DRAG DROP - (Topic 4) 

Drag the definition on the left to the correct term on the right. Not all definitions on the left will be used. 

Answer: 


Q24. - (Topic 3) 

Which three statements are correct about RIP version 2? (Choose three) 

A. It uses broadcast for its routing updates. 

B. It supports authentication. 

C. It is a classless routing protocol. 

D. It has a lower default administrative distance then RIP version 1. 

E. It has the same maximum hop count as RIP version 1. 

F. It does not send the subnet mask any updates. 

Answer: B,C,E 

Explanation: 

A and E are correct according to the theory of RIP. 

RIP version 1 updates are broadcasts, and RIP version 2 updates are multicast to 

224.0.0.9 -> B is not correct. 

RIP v1 is a classful routing protocol but RIP v2 is a classless routing protocol -> C is 

correct. 

RIPv1 and RIPv2 have the same default administrative distance of 120 -> D is not correct. 

RIPv2 is a classless routing protocol so it does send the subnet mask in updates -> F is not 

correct. 


Q25. - (Topic 4) 

How many addresses will be available for dynamic NAT translation when a router is configured with the following commands? 

Router(config)#ip nat pool TAME 209.165.201.23 209.165.201.30 netmask 

255.255.255.224 

Router(config)#ip nat inside source list 9 pool TAME 

A. 7 

B. 8 

C. 9 

D. 10 

E. 24 

F. 32 

Answer:

Explanation: 

209.165.201.23 to 209.165.201.30 provides for 8 addresses. 


Q26. - (Topic 7) 

When a router makes a routing decision for a packet that is received from one network and destined to another, which portion of the packet does if replace? 

A. Layer 2 frame header and trailer 

B. Layer 3 IP address 

C. Layer 5 session 

D. Layer 4 protocol 

Answer:

Explanation: 

Router Switching Function (1.2.1.1)A primary function of a router is to forward packets toward their destination. This is accomplished by using a switching function, which is the process used by a router to accept a packet on one interface and forward it out of another interface. A key responsibility of the switching function is to encapsulate packets in the appropriate data link frame type for the outgoing data link. NOTE In this context, the term “switching” literally means moving packets from source to destination and should not be confused with the function of a Layer 2 switch. After the router has determined the exit interface using the path determination function, the router must encapsulate the packet into the data link frame of the outgoing interface. What does a router do with a packet received from one network and destined for another network? The router performs the following three major steps: 

. Step 1. De-encapsulates the Layer 3 packet by removing the Layer 2 frame header and trailer. . Step 2. Examines the destination IP address of the IP packet to find the best path in the routing table. . Step 3. If the router finds a path to the destination, it encapsulates the Layer 3 packet into a new Layer 2 frame and forwards the frame out the exit interface. 


Q27. - (Topic 5) 

The network administrator has found the following problem. 

The remote networks 172.16.10.0, 172.16.20.0, and 172.16.30.0 are accessed through the Central router's serial 0/0 interface. No users are able to access 172.16.20.0. After reviewing the command output shown in the graphic, what is the most likely cause of the problem? 

A. no gateway of last resort on Central 

B. Central router's not receiving 172.16.20.0 update 

C. incorrect static route for 172.16.20.0 

D. 172.16.20.0 not located in Central's routing table 

Answer:

Explanation: 

If we use 172.16.20.0 to route to 172.16.150.15, then the packet will route back. To clear this error we have to use.#no ip route 172.16.20.0 255.255.255.0 172.16.150.15

.command in configuration mode. 


Q28. - (Topic 5) 

Refer to the exhibit. 

A network administrator is troubleshooting a connectivity problem on the serial interfaces. The output from the show interfaces command on both routers shows that the serial interface is up, line protocol is down. Given the partial output for the show running-config in the exhibit, what is the most likely cause of this problem? 

A. The serial cable is bad. 

B. The MTU is incorrectly configured. 

C. The Layer 2 framing is misconfigured. 

D. The IP addresses are not in the same subnet. 

Answer:

Explanation: 

Here we see that Rtr3 is configured to use PPP encapsulation, but Rtr1 has not been configured for any kind of encapsulation. The default on Cisco router serial interfaces is HDLC, not PPP, so there is an encapsulation mismatch. 


Q29. - (Topic 3) 

To allow or prevent load balancing to network 172.16.3.0/24, which of the following commands could be used in R2? (Choose two.) 

A. R2(config-if)#clock rate 

B. R2(config-if)#bandwidth 

C. R2(config-if)#ip ospf cost 

D. R2(config-if)#ip ospf priority 

E. R2(config-router)#distance ospf 

Answer: B,C 

Explanation: 

http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a0080094e9e.sht ml#t6 

The cost (also called metric) of an interface in OSPF is an indication of the overhead required to send packets across a certain interface. The cost of an interface is inversely proportional to the bandwidth of that interface. A higher bandwidth indicates a lower cost. There is more overhead (higher cost) and time delays involved in crossing a 56k serial line than crossing a 10M Ethernet line. The formula used to calculate the cost is: Cost = 10000 0000/bandwidth in bps For example, it will cost 10 EXP8/10 EXP7 = 10 to cross a 10M Ethernet line and will cost 10 EXP8/1544000 =64 to cross a T1 line. By default, the cost of an interface is calculated based on the bandwidth; you can force the cost of an interface with the ip ospf cost <value> interface subconfiguration mode command. 


Q30. - (Topic 7) 

Which statement about unicast frame forwarding on a switch is true? 

A. The TCAM table stores destination MAC addresses 

B. If the destination MAC address is unknown, the frame is flooded to every port that is configured in the same VLAN except on the port that it was received on. 

C. The CAM table is used to determine whether traffic is permitted or denied on a switch 

D. The source address is used to determine the switch port to which a frame is forwarded 

Answer: