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2021 Nov 200-105 latest exam

Q11. - (Topic 2) 

Which two statements about the OSPF Router ID are true? (Choose two.) 

A. It identifies the source of a Type 1 LSA. 

B. It should be the same on all routers in an OSPF routing instance. 

C. By default, the lowest IP address on the router becomes the OSPF Router ID. 

D. The router automatically chooses the IP address of a loopback as the OSPF Router ID. 

E. It is created using the MAC Address of the loopback interface. 

Answer: A,D 

Explanation: 

From the output of the “show ip ospf database”: r120#show ip ospf data 

OSPF Router with ID (10.0.0.120) (Process ID 1) 

Next, who are the other routers in our area? Router Link States (Area 1) Link ID.ADV Router.Age.Seq#.Checksum Link count 

10.0.0.111.10.0.0.111.600.0x8000023A 0x0092B3 1 

10.0.0.112.10.0.0.112.1246.0x80000234 0x009CAC 1 

10.0.0.113.10.0.0.113.148.0x8000022C 0x004399 3 

10.0.0.120.10.0.0.120.152.0x80000240 0x0046CB 1 This tells us there are four routers in Area 1. The router with RID 10.0.0.113 has 3 links in Area 1, every one else has only 1 link. Also the router will chose the highest loopback interface as its OSPF router ID (if available). 


Q12. - (Topic 1) 

Which two of these statements regarding RSTP are correct? (Choose two.) 

A. RSTP cannot operate with PVST+. 

B. RSTP defines new port roles. 

C. RSTP defines no new port states. 

D. RSTP is a proprietary implementation of IEEE 802.1D STP. 

E. RSTP is compatible with the original IEEE 802.1D STP. 

Answer: B,E 

Explanation: 

http://www.cisco.com/en/US/tech/tk389/tk621/technologies_white_paper09186a0080094cf a.shtml 

Port Roles The role is now a variable assigned to a given port. The root port and designated port roles remain, while the blocking port role is split into the backup and alternate port roles. The Spanning Tree Algorithm (STA) determines the role of a port based on Bridge Protocol Data Units (BPDUs). In order to simplify matters, the thing to remember about a BPDU is there is always a method to compare any two of them and decide whether one is more useful than the other. This is based on the value stored in the BPDU and occasionally on the port on which they are received. This considered, the information in this section explains practical approaches to port roles. 

Compatibility with 802.1D RSTP is able to interoperate with legacy STP protocols. However, it is important to note that the inherent fast convergence benefits of 802.1w are lost when it interacts with legacy bridges. 


Q13. - (Topic 3) 

What can be done to Frame Relay to resolve split-horizon issues?(Choose two.) 

A. Disable Inverse ARP. 

B. Create a full-mesh topology. 

C. Develop multipoint subinterfaces. 

D. Configure point-to-point subinterfaces. 

E. Remove the broadcast keyword from the frame-relay map command. 

Answer: B,D 

Explanation: 

IP split horizon checking is disabled by default for Frame Relay encapsulation to allow routing updates to go in and out of the same interface. An exception is the Enhanced Interior Gateway Routing Protocol (EIGRP) for which split horizon must be explicitly disabled. Certain protocols such as AppleTalk, transparent bridging, and Internetwork Packet Exchange (IPX) cannot be supported on partially meshed networks because they require split horizon to be enabled (a packet received on an interface cannot be transmitted over the same interface, even if the packet is received and transmitted on different virtual circuits). Configuring Frame Relay subinterfaces ensures that a single physical interface is treated as multiple virtual interfaces. This capability allows you to overcome split horizon rules so packets received on one virtual interface can be forwarded to another virtual interface, even if they are configured on the same physical interface. 


Q14. - (Topic 3) 

Refer to the exhibit. 

Which WAN protocol is being used? 

A. ATM 

B. HDLC 

C. Frame Relay 

D. PPP 

Answer:

Explanation: 

"Show interface pos8/0/0" command showing LMI enq sent which show frame-relay encapsulation enabled on this interface. Cisco supports three different Local Management Interface (LMI) types for Frame Relay: Cisco, ANSI Annex D, and Q933-A Annex A http://www.ciscopress.com/articles/article.asp?p=170741&seqNum=3 


Q15. - (Topic 2) 

What can cause two OSPF neighbors to be stuck in the EXSTART state? 

A. There is a low bandwidth connection between neighbors. 

B. The neighbors have different MTU settings. 

C. The OSPF interfaces are in a passive state. 

D. There is only layer one connectivity between neighbors. 

Answer:

Explanation: 

Neighbors Stuck in Exstart/Exchange State The problem occurs most frequently when attempting to run OSPF between a Cisco router and another vendor's router. The problem occurs when the maximum transmission unit (MTU) settings for neighboring router interfaces don't match. If the router with the higher MTU sends a packet larger that the MTU set on the neighboring router, the neighboring router ignores the packet.0 When this problem occurs, the output of the show ip ospf neighbor command displays output similar that shown below: router-6# show ip ospf neighbor 

Neighbor ID Pri State Dead Time Address Interface 

170.170.11.7 1 EXCHANGE/ - 00:00:36 170.170.11.7 Serial2.7 router-6# router-7# show ip ospf neighbor 

Neighbor ID Pri State Dead Time Address Interface 

170.170.11.6 1 EXSTART/ - 00:00:33 170.170.11.6 Serial0.6 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13684-12.html 


Up to the immediate present 200-105 question:

Q16. - (Topic 2) 

A network administrator is troubleshooting an EIGRP problem on a router and needs to confirm the IP addresses of the devices with which the router has established adjacency. The retransmit interval and the queue counts for the adjacent routers also need to be checked. What command will display the required information? 

A. Router# show ip eigrp adjacency 

B. Router# show ip eigrp topology 

C. Router#show ip eigrp interfaces 

D. Router#show ip eigrp neighbors 

Answer:

Explanation: 

Implementing EIGRP http://www.ciscopress.com/articles/article.asp?p=1171169&seqNum=3Below is an example of the show ip eigrp neighbors command. The retransmit interval (Smooth Round Trip Timer – SRTT) and the queue counts (Q count, which shows the number of queued EIGRP packets) for the adjacent routers are listed: R1#show ip eigrp neighbors IP-EIGRP neighbors for process 1 H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 

0 10.10.10.2 Fa0/0 12 00:00:39 1282 5000 0 3 


Q17. - (Topic 1) 

Which three of these statements regarding 802.1Q trunking are correct? (Choose three.) 

A. 802.1Q native VLAN frames are untagged by default. 

B. 802.1Q trunking ports can also be secure ports. 

C. 802.1Q trunks can use 10 Mb/s Ethernet interfaces. 

D. 802.1Q trunks require full-duplex, point-to-point connectivity. 

E. 802.1Q trunks should have native VLANs that are the same at both ends. 

Answer: A,C,E 

Explanation: 

CCNA Self-Study (ICND Exam): Extending Switched Networks with Virtual LANs http://www.ciscopress.com/articles/article.asp?p=102157&seqNum=2 


Q18. - (Topic 3) 

What is the advantage of using a multipoint interface instead of point-to-point subinterfaces when configuring a Frame Relay hub in a hub-and-spoke topology? 

A. It avoids split-horizon issues with distance vector routing protocols. 

B. IP addresses can be conserved if VLSM is not being used for subnetting. 

C. A multipoint interface offers greater security compared to point-to-point subinterface configurations. 

D. The multiple IP network addresses required for a multipoint interface provide greater addressing flexibility over point-to-point configurations. 

Answer:

Explanation: 

You do not have to assign a separate subnet per sub-interface .if you're using a Class A network (10.x.x.x/8), you blow the whole network on a few connections (if you used VLSM, you could use a better mask, limit the addresses used). if you used 10.0.0.0/8, you would not be assigning the entire /8 to a single network. You would select a subnet mask for the network and then, you would have to use that mask with all subnets of the network. So if you chose a /24 mask, that would mean that you would have to use a /24 mask for even point-to-point links. 


Q19. - (Topic 1) 

What are two characteristics of a switch that is configured as a VTP client? (Choose two.) 

A. If a switch that is configured to operate in client mode cannot access a VTP server, then the switch reverts to transparent mode. 

B. On switches that are configured to operate in client mode, VLANs can be created, deleted, or renamed locally. 

C. The local VLAN configuration is updated only when an update that has a higher configuration revision number is received. 

D. VTP advertisements are not forwarded to neighboring switches that are configured in VTP transparent mode. 

E. VTP client is the default VTP mode. 

F. When switches in VTP client mode are rebooted, they send a VTP advertisement request to the VTP servers. 

Answer: C,F 

Explanation: 

VLAN Trunking Protocol (VTP) http://archive.networknewz.com/2004/0317.html 

VTP Modes Server Mode Once VTP is configured on a Cisco switch, the default mode used is Server Mode. In any given VTP management domain, at least one switch must be in Server Mode. When in Server Mode, a switch can be used to add, delete, and modify VLANs, and this information will be passed to all other switches in the VTP management domain. Client Mode When a switch is configured to use VTP Client Mode, it is simply the recipient of any VLANs added, deleted, or modified by a switch in Server Mode within the same management domain. A switch in VTP client mode cannot make any changes to VLAN information. Transparent Mode A switch in VTP Transparent Mode will pass VTP updates received by switches in Server Mode to other switches in the VTP management domain, but will not actually process the contents of these messages. When individual VLANs are added, deleted, or modified on a switch running in transparent mode, the changes are local to that particular switch only, and are not passed to other switches in the VTP management domain. 


Q20. - (Topic 3) 

Refer to the exhibit. 

A technician pastes the configurations in the exhibit into the two new routers shown. Otherwise, the routers are configured with their default configurations. A ping from Host1 to Host2 fails, but the technician is able to ping the S0/0 interface of R2 from Host1. The configurations of the hosts have been verified as correct. What is the cause of the problem? 

A. The serial cable on R1 needs to be replaced. 

B. The interfaces on R2 are not configured properly. 

C. R1 has no route to the 192.168.1.128 network. 

D. The IP addressing scheme has overlapping subnetworks. 

E. The ip subnet-zero command must be configured on both routers. 

Answer:

Explanation: 

Whenever a node needs to send data to another node on a network, it must first know where to send it. If the node cannot directly connect to the destination node, it has to send it via other nodes along a proper route to the destination node. A remote network is a network that can only be reached by sending the packet to another router. Remote networks are added to the routing table using either a dynamic routing protocol or by configuring static routes. Static routes are routes to networks that a network administrator manually configured.So R should have static route for the 192.168.1.128.