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2021 Dec 200-105 sample question

Q1. - (Topic 2) 

Refer to the exhibit. 

C-router is to be used as a "router-on-a-stick" to route between the VLANs. All the interfaces have been properly configured and IP routing is operational. The hosts in the VLANs have been configured with the appropriate default gateway. What is true about this configuration? 

A. These commands need to be added to the configuration: C-router(config)# router eigrp 123 C-router(config-router)# network 172.19.0.0 

B. These commands need to be added to the configuration: C-router(config)# router ospf 1 C-router(config-router)# network 172.19.0.0 0.0.3.255 area 0 

C. These commands need to be added to the configuration: C-router(config)# router rip C-router(config-router)# network 172.19.0.0 

D. No further routing configuration is required. 

Answer:

Explanation: 

http://www.cisco.com/en/US/tech/tk389/tk815/technologies_configuration_example09186a 00800949fd.shtml https://learningnetwork.cisco.com/servlet/JiveServlet/download/5669-2461/Router%20on%20a%20Stick.pdf. 


Q2. - (Topic 2) 

Refer to the exhibit. 

What address is a feasible successor? 

A. 172.16.4.0 

B. 10.1.4.4 

C. 10.1.2.2 

D. 172.16.3.0 

Answer: C Explanation: 

The feasible condition states: 

“To qualify as a feasible successor, a router must have an AD less than the FD of the current successor route”. 

In this case, we see 10.1.2.2 shows an AD less than the current successor of 10.1.4.4 


Q3. - (Topic 1) 

Refer to the exhibit. 

A technician has configured the FastEthernet 0/1 interface on Sw11 as an access link in VLAN 1. Based on the output from the show vlan brief command issued on Sw12, what will be the result of making this change on Sw11? 

A. Only the hosts in VLAN 1 on the two switches will be able to communicate with each other. 

B. The hosts in all VLANs on the two switches will be able to communicate with each other. 

C. Only the hosts in VLAN 10 and VLAN 15 on the two switches will be able to communicate with each other. 

D. Hosts will not be able to communicate between the two switches. 

Answer:

Explanation: 

VLANs are local to each switch's database, and VLAN information is not passed between switches without implementing VLAN Trunk Protocol (VTP). Trunks carry traffic from all VLANs to and from the switch by default but, can be configured to carry only specified VLAN traffic. Trunk links are required to pass VLAN information between switches. So Sw11 port should be trunk not access port. Additionally, there are no ports assigned to VLAN 1. 


Q4. - (Topic 2) 

Refer to the exhibit. 

Based on the exhibited routing table, how will packets from a host within the 192.168.10.192/26 LAN be forwarded to 192.168.10.1? 

A. The router will forward packets from R3 to R2 to R1. 

B. The router will forward packets from R3 to R1 to R2. 

C. The router will forward packets from R3 to R2 to R1 AND from R3 to R1. 

D. The router will forward packets from R3 to R1. 

Answer:

Explanation: 

From the routing table we learn that network 192.168.10.0/30 is learned via 2 equal- cost paths (192.168.10.9 &192.168.10.5) - traffic to this network will be load-balanced. 


Q5. - (Topic 2) 

What are two drawbacks of implementing a link-state routing protocol? (Choose two.) 

A. the sequencing and acknowledgment of link-state packets B. the requirement for a hierarchical IP addressing scheme for optimal functionality 

C. the high volume of link-state advertisements in a converged network 

D. the high demand on router resources to run the link-state routing algorithm 

E. the large size of the topology table listing all advertised routes in the converged network 

Answer: B,D 

Explanation: 

Link State routing protocols, such as OSPF and IS-IS, converge more quickly than their distance vector routing protocols such as RIPv1, RIPv2, EIGRP and so on, through the use of flooding and triggered updates. In link state protocols, changes are flooded immediately and computed in parallel. Triggered updates improve convergence time by requiring routers to send an update message immediately upon learning of a route change. These updates are triggered by some event, such as a new link becoming available oor an existing link failing. The main drawbacks to link state routing protocols are the amount of CPU overhead involved in calculating route changes and memory resources that are required to store neighbor tables, route tables and a complete topology table. http://www.ciscopress.com/articles/article.asp?p=24090&seqNum=4 


Rebirth 200-105 exam cram:

Q6. - (Topic 2) 

A router receives information about network 192.168.10.0/24 from multiple sources. What will the router consider the most reliable information about the path to that network? 

A. an OSPF update for network 192.168.0.0/16 

B. a static route to network 192.168.10.0/24 

C. a static route to network 192.168.10.0/24 with a local serial interface configured as the next hop 

D. a RIP update for network 192.168.10.0/24 

E. a directly connected interface with an address of 192.168.10.254/24 

F. a default route with a next hop address of 192.168.10.1 

Answer:

Explanation: 

What Is Administrative Distance? http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094195.shtml 

Select the Best Path Administrative distance is the first criterion that a router uses to determine which routing protocol to use if two protocols provide route information for the same destination. Administrative distance is a measure of the trustworthiness of the source of the routing information. Administrative distance has only local significance, and is not advertised in routing updates. Note: The smaller the administrative distance value, the more reliable the protocol. For example, if a router receives a route to a certain network from both Open Shortest Path First (OSPF) (default administrative distance - 110) and Interior Gateway Routing Protocol (IGRP) (default administrative distance - 100), the router chooses IGRP because IGRP is more reliable. This means the router adds the IGRP version of the route to the routing table. 


Q7. - (Topic 2) 

What is the default administrative distance of OSPF? 

A. 90 

B. 100 

C. 110 

D. 120 

Answer:

Explanation: 

Default Distance Value Table This table lists the administrative distance default values of the protocols that Cisco supports: 


Q8. - (Topic 3) 

Which command is used to enable CHAP authentication, with PAP as the fallback method, on a serial interface? 

A. Router(config-if)# ppp authentication chap fallback ppp 

B. Router(config-if)# ppp authentication chap pap 

C. Router(config-if)# authentication ppp chap fallback ppp 

D. Router(config-if)# authentication ppp chap pap 

Answer:

Explanation: 

The command “ppp authentication chap pap” command indicates the CHAP authentication is used first. If it fails or is rejected by other side then uses PAP instead. If you want to use PAP first (then CHAP) you can use the “ppp authentication pap chap” command 

Reference: http://www.cisco.com/en/US/docs/ios/12_2/security/configuration/guide/scfathen.html 


Q9. - (Topic 2) 

Refer to the exhibit. 

Assume that all of the router interfaces are operational and configured correctly. How will router R2 be affected by the configuration of R1 that is shown in the exhibit? 

A. Router R2 will not form a neighbor relationship with R1. 

B. Router R2 will obtain a full routing table, including a default route, from R1. 

C. R2 will obtain OSPF updates from R1, but will not obtain a default route from R1. 

D. R2 will not have a route for the directly connected serial network, but all other directly connected networks will be present, as well as the two Ethernet networks connected to R1. 

Answer:

Explanation: 

Open Shortest Path First http://en.wikipedia.org/wiki/Open_Shortest_Path_First 

The configuration of R1 shows "router ospf 1" however, the diagram also shows that both routers should be in the backbone OSPF Area of "0". When routers are in different OSPF areas they will not form a neighbor relationship. Neighbor relationships As a link state routing protocol, OSPF establishes and maintains neighbor relationships in order to exchange routing updates with other routers. The neighbor relationship table is called an adjacency database in OSPF. Provided that OSPF is configured correctly, OSPF forms neighbor relationships only with the routers directly connected to it. In order to form a neighbor relationship between two routers, the interfaces used to form the relationship must be in the same area. Generally an interface is only configured in a single area, however you can configure an interface to belong to multiple areas. In the second area, such an interface must be configured as a secondary interface. (A neighbor state simulation shows how neighbor state changes from Down to Full Adjacency progressively with exchanging Hello, DD, Request, Update, and Ack packets). 


Q10. - (Topic 3) 

Which two statistics appear in show frame-relay map output? (Choose two.) 

A. the number of BECN packets that are received by the router 

B. the value of the local DLCI 

C. the number of FECN packets that are received by the router 

D. the status of the PVC that is configured on the router 

E. the IP address of the local router 

Answer: B,D 

Explanation: 

Frame Relay Commands (map-class frame-relay through threshold ecn) 

http://www.cisco.com/en/US/docs/ios/12_2/wan/command/reference/wrffr4.html#wp102934 

Examples 

The following is sample output from the show frame-relay map command: 

Router#show frame-relay map Serial 1 (administratively down): ip 10.108.177.177 

dlci 177 (0xB1,0x2C10), static, broadcast, 

CISCO 

TCP/IP Header Compression (inherited), passive (inherited)