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2017 Mar 200-105 vce

Q41. - (Topic 1) 

Which three statements about RSTP are true? (Choose three.) 

A. RSTP significantly reduces topology reconverging time after a link failure. 

B. RSTP expands the STP port roles by adding the alternate and backup roles. 

C. RSTP port states are blocking, discarding, learning, or forwarding. 

D. RSTP provides a faster transition to the forwarding state on point-to-point links than STP does. 

E. RSTP also uses the STP proposal-agreement sequence. 

F. RSTP uses the same timer-based process as STP on point-to-point links. 

Answer: A,B,D 

Explanation: 

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

a.shtml 

Convergence 

Cisco enhanced the original 802.1D specification with features such as Uplink Fast, 

Backbone Fast, and Port Fast to speed up the convergence time of a bridged network. The 

drawback is that these mechanisms are proprietary and need additional configuration. 

Alternate and Backup Port Roles 

These two port roles correspond to the blocking state of 802.1D. A blocked port is defined 

as not being the designated or root port. A blocked port receives a more useful BPDU than 

the one it sends out on its segment. 

Remember that a port absolutely needs to receive BPDUs in order to stay blocked. RSTP 

introduces these two roles for this purpose. 

Rapid Transition to Forwarding State 

Rapid transition is the most important feature introduced by 802.1w. The legacy STA 

passively waited for the network to converge before it turned a port into the forwarding 

state. The achievement of faster convergence was a matter of tuning the conservative 

default parameters (forward delay and max_age timers) and often put the stability of the 

network at stake. The new rapid STP is able to actively confirm that a port can safely 

transition to the forwarding state without having to rely on any timer configuration. There is 

now a real feedback mechanism that takes place between RSTP-compliant bridges. In order to achieve fast convergence on a port, the protocol relies upon two new variables: edge ports and link type. 


Q42. - (Topic 3) 

Refer to the exhibit. 

What is the meaning of the term dynamic as displayed in the output of the show frame-relay map command shown? 

A. The Serial0/0 interface is passing traffic. 

B. The DLCI 100 was dynamically allocated by the router 

C. The Serial0/0 interface acquired the IP address of 172.16.3.1 from a DHCP server 

D. The DLCI 100 will be dynamically changed as required to adapt to changes in the Frame Relay cloud 

E. The mapping between DLCI 100 and the end station IP address 172.16.3.1 was learned through Inverse ARP 

Answer:

Explanation: 

The term dynamic indicates that the DLCI number and the remote router IP address 

172.16.3.1 are learned via the Inverse ARP process. 

Inverse ARP is a technique by which dynamic mappings are constructed in a network, allowing a device such as a router to locate the logical network address and associate it with a permanent virtual circuit (PVC). 


Q43. - (Topic 3) 

Refer to the exhibit. 

Which statement describes DLCI 17? 

A. DLCI 17 describes the ISDN circuit between R2 and R3. 

B. DLCI 17 describes a PVC on R2. It cannot be used on R3 or R1. 

C. DLCI 17 is the Layer 2 address used by R2 to describe a PVC to R3. 

D. DLCI 17 describes the dial-up circuit from R2 and R3 to the service provider. 

Answer:

Explanation: 

DLCI stands for Data Link Connection Identifier. DLCI values are used on Frame Relay interfaces to distinguish between different virtual circuits. DLCIs have local significance because, the identifier references the point between the local router and the local Frame Relay switch to which the DLCI is connected. 


Q44. - (Topic 1) 

Which protocol provides a method of sharing VLAN configuration information between two Cisco switches? 

A. STP 

B. VTP 

C. 802.1Q 

D. RSTP 

Answer:

Explanation: 

Understanding VLAN Trunk Protocol (VTP) http://www.cisco.com/en/US/tech/tk389/tk689/technologies_tech_note09186a0080094c52. shtml 

Introduction VLAN Trunk Protocol (VTP) reduces administration in a switched network. When you configure a new VLAN on one VTP server, the VLAN is distributed through all switches in the domain. This reduces the need to configure the same VLAN everywhere. VTP is a Cisco-proprietary protocol that is available on most of the Cisco Catalyst series products. 


Q45. - (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 


Renewal 200-105 download:

Q46. - (Topic 3) 

What are two characteristics of Frame Relay point-to-point subinterfaces? (Choose two.) 

A. They create split-horizon issues. 

B. They require a unique subnet within a routing domain. 

C. They emulate leased lines. 

D. They are ideal for full-mesh topologies. 

E. They require the use of NBMA options when using OSPF. 

Answer: B,C 

Explanation: http://www.ciscopress.com/articles/article.asp?p=170741&seqNum=5 

Configuring Frame Relay Subinterfaces On partially meshed Frame Relay networks, the problem of split horizon can be overcome by using Frame Relay subinterfaces. Frame Relay provides a mechanism to allow a physical interface to be partitioned into multiple virtual interfaces. In a similar way, using subinterfaces allows a partially meshed network to be divided into a number of smaller, fully meshed point-to-point networks. Generally, each point-to-point subnetwork is assigned a unique network address. This allows packets received on one physical interface to be sent out from the same physical interface, albeit forwarded on VCs in different subinterfaces. There are two types of subinterfaces supported by Cisco routers: point-to-point and multipoint subinterfaces. 


Q47. - (Topic 2) 

What are two benefits of using a single OSPF area network design? (Choose two.) 

A. It is less CPU intensive for routers in the single area. 

B. It reduces the types of LSAs that are generated. 

C. It removes the need for virtual links. 

D. It increases LSA response times. 

E. It reduces the number of required OSPF neighbor adjacencies. 

Answer: B,C 

Explanation: 

OSPF uses a LSDB (link state database) and fills this with LSAs (link state advertisement). The link types are as follows: 

LSA Type 1:. Router LSA  

LSA Type 2:.. . . . . . . .  Network LSA  

LSA Type 3:. Summary LSA  

LSA Type 4:. Summary ASBR LSA  

LSA Type 5:. Autonomous system external LSA  

LSA Type 6:. Multicast OSPF LSA  

LSA Type 7:. Not-so-stubby area LSA  

LSA Type 8:. External attribute LSA for BGP  

If all routers are in the same area, then many of these LSA types (Summary ASBR LSA, external LSA, etc) will not be used and will not be generated by any router. 

All areas in an Open Shortest Path First (OSPF) autonomous system must be physically connected to the backbone area (Area 0). In some cases, where this is not possible, you can use a virtual link to connect to the backbone through a non-backbone area. You can also use virtual links to connect two parts of a partitioned backbone through a non-backbone area. The area through which you configure the virtual link, known as a transit area, must have full routing information. The transit area cannot be a stub area. Virtual links are not ideal and should really only be used for temporary network solutions or migrations. However, if all locations are in a single OSPF area this is not needed. 


Q48. - (Topic 2) 

What are the two default metrics used by EIGRP for route selection? (Choose two.) 

A. Bandwidth 

B. Delay 

C. Reliability 

D. Load 

E. MTU 

Answer: A,B 

Explanation: 

EIGRP adds together weighted values of different network link characteristics in order to calculate a metric for evaluating path selection. 

These characteristics include: 

. Delay (measured in 10s of microseconds) 

. Bandwidth (measured in kilobytes per second) 

. Reliability (in numbers ranging from 1 to 255; 255 being the most reliable) 

. Load (in numbers ranging from 1 to 255; 255 being saturated) 

Various constants (K.1.through K.5) are able to be set by a user to produce varying routing behaviors. However by default, only delay and bandwidth are used in the weighted formula to produce a single 32bit metric: 

Note:.Default K values are:.K1.=.K3.= 1 and.K2.=.K4.=.K5.= 0When K5.is equal to 0 then [ 

K5/(.K4.+ reliability)] is defined to be 1 

Use of the default constants effectively reduces the formula above to: 

Reference: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/enhanced-interior-gateway-routing-protocol-eigrp/whitepaper_C11-720525.html 


Q49. - (Topic 2) 

What can be done to secure the virtual terminal interfaces on a router? (Choose two.) 

A. Administratively shut down the interface. 

B. Physically secure the interface. 

C. Create an access list and apply it to the virtual terminal interfaces with the access-group command. 

D. Configure a virtual terminal password and login process. 

E. Enter an access list and apply it to the virtual terminal interfaces using the access-class command. 

Answer: D,E 

Explanation: 

It is a waste to administratively shut down the interface. Moreover, someone can still access the virtual terminal interfaces via other interfaces -> A is not correct. 

We can not physically secure a virtual interface because it is “virtual” -> B is not correct. 

To apply an access list to a virtual terminal interface we must use the “access-class” command. The “access-group” command is only used to apply an access list to a physical interface -> C is not correct; E is correct. 

The most simple way to secure the virtual terminal interface is to configure a username & password to prevent unauthorized login -> D is correct. 


Q50. - (Topic 2) 

Refer to the exhibit. 

How will the router handle a packet destined for 192.0.2.156? 

A. The router will drop the packet. 

B. The router will return the packet to its source. 

C. The router will forward the packet via Serial2. 

D. The router will forward the packet via either Serial0 or Serial1. 

Answer:

Explanation: 

Router has pointed default router to 192.168.4.1 and this subnet is connected via serial 2 interface. Router does not have router for the 192.0.2.156. so it will use the default gateway 

192.168.4.1. A default route identifies the gateway IP address to which the router sends all IP packets for which it does not have a learned or static route.