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April 3, 2017

Apr 2017 updated: Exambible Cisco 100-105 free question 21-30

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2017 Apr 100-105 torrent

Q21. - (Topic 3) 

Which characteristics are representative of a link-state routing protocol? (Choose three.) 

A. provides common view of entire topology 

B. exchanges routing tables with neighbors C. calculates shortest path 

D. utilizes event-triggered updates 

E. utilizes frequent periodic updates 

Answer: A,C,D 

Explanation: 

Each of routers running link-state routing protocol learns paths to all the destinations in its 

“area” so we can say although it is a bit unclear. 

Link-state routing protocols generate routing updates only (not the whole routing table) 

when a change occurs in the network topology so 

Link-state routing protocol like OSPF uses Dijkstra algorithm to calculate the shortest path -> . 

Unlike Distance vector routing protocol (which utilizes frequent periodic updates), link-state 

routing protocol utilizes event-triggered updates (only sends update when a change occurs) 

-> 


Q22. - (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. 


Q23. - (Topic 1) 

Refer to the exhibit. 

SwitchA receives the frame with the addressing shown. According to the command output also shown in the exhibit, how will SwitchA handle this frame? 

A. It will drop the frame. 

B. It will forward the frame out port Fa0/6 only. 

C. It will flood the frame out all ports. 

D. It will flood the frame out all ports except Fa0/3. 

Answer: B Explanation: 

Switches keep the learned MAC addresses in a table, so that when a frame comes in with a destination MAC address that the switch has already learned, it will forward it to that port only. If a frame comes in with a destination MAC that is not already in the MAC address table, then the frame will be flooded to all ports except for the one that it came in on. In this case, Switch A already knows that 00b0.d0da.cb56 resides on port fa0/6, so it will forward the from out that port. 


Q24. - (Topic 1) 

Refer to the exhibit. 

The output is from a router in a large enterprise. From the output, determine the role of the router. 

A. A Core router. 

B. The HQ Internet gateway router. 

C. The WAN router at the central site. 

D. Remote stub router at a remote site. 

Answer:

Explanation: 

Since the routing table shows only a single default route using the single interface serial 0/0, we know that this is most likely a remote stub site with a single connection to the rest of the network. All the other answer options would mean that this router would have more connections, and would contain more routes. 


Q25. - (Topic 7) 

Under which circumstance should a network administrator implement one-way NAT? 

A. when the network must route UDP traffic 

B. when traffic that originates outside the network must be routed to internal hosts 

C. when traffic that originates inside the network must be routed to internal hosts 

D. when the network has few public IP addresses and many private IP addresses require outside access 

Answer:

Explanation: NAT operation is typically transparent to both the internal and external hosts. Typically the internal host is aware of the true IP address and TCP or UDP port of the external host. Typically the NAT device may function as the default gateway for the internal host. However the external host is only aware of the public IP address for the NAT device and the particular port being used to communicate on behalf of a specific internal host. 

NAT and TCP/UDP 

"Pure NAT", operating on IP alone, may or may not correctly parse protocols that are totally concerned with IP information, such as ICMP, depending on whether the payload is interpreted by a host on the "inside" or "outside" of translation. As soon as the protocol stack is traversed, even with such basic protocols as TCP and UDP, the protocols will break unless NAT takes action beyond the network layer. IP packets have a checksum in each packet header, which provides error detection only for the header. IP datagrams may become fragmented and it is necessary for a NAT to reassemble these fragments to allow correct recalculation of higher-level checksums and correct tracking of which packets belong to which connection. The major transport layer protocols, TCP and UDP, have a checksum that covers all the data they carry, as well as the TCP/UDP header, plus a "pseudo-header" that contains the source and destination IP addresses of the packet carrying the TCP/UDP header. For an originating NAT to pass TCP or UDP successfully, it must recompute the TCP/UDP header checksum based on the translated IP addresses, not the original ones, and put that checksum into the TCP/UDP header of the first packet of the fragmented set of packets. The receiving NAT must recompute the IP checksum on every packet it passes to the destination host, and also recognize and recompute the TCP/UDP header using the retranslated addresses and pseudo-header. This is not a completely solved problem. One solution is for the receiving NAT to reassemble the entire segment and then recompute a checksum calculated across all packets. The originating host may perform Maximum transmission unit (MTU) path discovery to determine the packet size that can be transmitted without fragmentation, and then set the don't fragment (DF) bit in the appropriate packet header field. Of course, this is only a one-way solution, because the responding host can send packets of any size, which may be fragmented before reaching the NAT. 


Regenerate 100-105 practice:

Q26. - (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:


Q27. - (Topic 5) 

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:

Explanation: 

Initially the MAC address had to be resolved, but once it is resolved and is in the ARP table of the router, pings go through immediately. 


Q28. - (Topic 3) 

Some routers have been configured with default routes. What are some of the advantages 

of using default routes? (Choose two) 

A. They establish routes that will never go down. 

B. They keep routing tables small. 

C. They require a great deal of CPU power. 

D. They allow connectivity to remote networks that are not in the routing table 

E. They direct traffic from the internet into corporate networks. 

Answer: B,D 

Explanation: 

Cisco administration 101: What you need to know about default routes Reference: 

http://www.techrepublic.com/article/cisco-administration-101-what-you-need-to-know-about-default-routes/ 


Q29. - (Topic 3) 

What is the default administrative distance of OSPF? 

A. 90 

B. 100 

C. 110 

D. 120 

Answer:

Explanation: 

Administrative distance is the feature that routers use in order to select the best path when there are two or more different routes to the same destination from two different routing protocols. Administrative distance defines the reliability of a routing protocol. Each routing protocol is prioritized in order of most to least reliable (believable) with the help of an administrative distance value. 

Default Distance Value Table 

This table lists the administrative distance default values of the protocols that Cisco supports: 


Q30. - (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. 



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