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2021 Oct 200-105 free practice exam

Q51. - (Topic 2) 

What does a router do if it has no EIGRP feasible successor route to a destination network and the successor route to that destination network is in active status? 

A. It routes all traffic that is addressed to the destination network to the interface indicated in the routing table. 

B. It sends a copy of its neighbor table to all adjacent routers. 

C. It sends a multicast query packet to all adjacent neighbors requesting available routing paths to the destination network. 

D. It broadcasts Hello packets to all routers in the network to re-establish neighbor adjacencies. 

Answer:

Explanation: 

Introduction to EIGRP Reference: 

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f07.shtml 

Feasible Successors 

A destination entry is moved from the topology table to the routing table when there is a feasible successor. All minimum cost paths to the destination form a set. From this set, the neighbors that have an advertised metric less than the current routing table metric are considered feasible successors. 

Feasible successors are viewed by a router as neighbors that are downstream with respect to the destination. 

These neighbors and the associated metrics are placed in the forwarding table. 

When a neighbor changes the metric it has been advertising or a topology change occurs in the network, the set of feasible successors may have to be re-evaluated. However, this is not categorized as a route recomputation. 

Route States 

A topology table entry for a destination can have one of two states. A route is considered in the Passive state when a router is not performing a route recomputation. The route is in Active state when a router is undergoing a route recomputation. If there are always feasible successors, a route never has to go into Active state and avoids a route recomputation. 

When there are no feasible successors, a route goes into Active state and a route recomputation occurs. A route recomputation commences with a router sending a query packet to all neighbors. Neighboring routers can either reply if they have feasible successors for the destination or optionally return a query indicating that they are performing a route recomputation. While in Active state, a router cannot change the next-hop neighbor it is using to forward packets. Once all replies are received for a given query, the destination can transition to Passive state and a new successor can be selected. 

When a link to a neighbor that is the only feasible successor goes down, all routes through that neighbor commence a route recomputation and enter the Active state. 


Q52. - (Topic 1) 

Refer to the exhibit 

Which switch provides the spanning-tree designated port role for the network segment that services the printers? 

A. Switch1 

B. Switch2 

C. Switch3 

D. Switch4 

Answer:

Explanation: 

First, the question asks what switch services the printers, so it can be Switch 3 or Switch 4 

which is connected directly to the Printers. 

Designated port is a port that is in the forwarding state. All ports of the root bridge are 

designated ports. 

Switch 3 and Switch 4 has same priority so it will see on lowest MAC address and here 

switch 3 has lowest MAC address. So switch 3 segment will play a Designated port role. 

By comparing the MAC address of Switch 3 and Switch 4 we found that the MAC of Switch 

3 is smaller. Therefore the interface connected to the Printers of Switch 3 will become 

designated interface and the interface of Switch 4 will be blocked. 


Q53. - (Topic 1) 

Which port state is introduced by Rapid-PVST? 

A. learning 

B. listening 

C. discarding 

D. forwarding 

Answer:

Explanation: 

Spanning Tree from PVST+ to Rapid-PVST Migration Configuration Example Reference 1: http://www.cisco.com/en/US/products/hw/switches/ps708/products_configuration_example 09186a00807b0670.shtml 

Reference 2: http://www.cisco.com/en/US/tech/tk389/tk621/technologies_white_paper09186a0080094cf a.shtml 

PVST+ is based on IEEE802.1D Spanning Tree Protocol (STP). But PVST+ has only 3 port states (discarding, learning and forwarding) while STP has 5 port states (blocking, listening, learning, forwarding and disabled). So discarding is a new port state in PVST+. 

Background Information 

802.1D Spanning Tree Protocol (STP) has a drawback of slow convergence. Cisco 

Catalyst switches support three types of STPs, which are PVST+, rapid-PVST+ and MST. 

PVST+ is based on IEEE802.1D standard and includes Cisco proprietary extensions such 

as BackboneFast, UplinkFast, and PortFast. Rapid-PVST+ is based on IEEE 802.1w 

standard and has a faster convergence than 802.1D. RSTP (IEEE 802.1w) natively 

includes most of the Cisco proprietary enhancements to the 802.1D Spanning Tree, such 

as BackboneFast and UplinkFast. Rapid-PVST+ has these unique features: 

Uses Bridge Protocol Data Unit (BPDU) version 2 which is backward compatible with the 

802.1D STP, which uses BPDU version 0. 

All the switches generate BPDUs and send out on all the ports every 2 seconds, whereas 

in 802.1D STP only the root bridge sends the configuration BPDUs. 

Port Roles—Root port, designated port, alternate port and backup port. 

Port States—Discarding, Learning, and Forwarding. 

Port Types—Edge Port (PortFast), Point-to-Point and Shared port. 

Rapid-PVST uses RSTP to provide faster convergence. When any RSTP port receives 

legacy 802.1D BPDU, it falls back to legacy STP and the inherent fast convergence 

benefits of 802.1w are lost when it interacts with legacy bridges. 


Q54. - (Topic 1) 

Refer to the exhibit. 

What commands must be configured on the 2950 switch and the router to allow communication between host 1 and host 2? (Choose two.) 

A. Router(config)# interface fastethernet 0/0 Router(config-if)# ip address 192.168.1.1 255.255.255.0 Router(config-if)# no shut down 

B. Router(config)# interface fastethernet 0/0 Router(config-if)# no shut down Router(config)# interface fastethernet 0/0.1 Router(config-subif)# encapsulation dot1q 10 Router(config-subif)# ip address 192.168.10.1 255.255.255.0 

Router(config)# interface fastethernet 0/0.2 Router(config-subif)# encapsulation dot1q 20 Router(config-subif)# ip address 192.168.20.1 255.255.255.0 

C. Router(config)# router eigrp 100 Router(config-router)# network 192.168.10.0 Router(config-router)# network 192.168.20.0 

D. Switch1(config)# vlan database Switch1(config-vlan)# vtp domain XYZ Switch1(config-vlan)# vtp server 

E. Switch1(config)# interface fastethernet 0/1 Switch1(config-if)# switchport mode trunk 

F. Switch1(config)# interface vlan 1 Switch1(config-if)# ip default-gateway 192.168.1.1 

Answer: B,E 

Explanation: 

The two answers B and E list all the commands needed to configure interVLAN routing. Please notice that Cisco switch 2950, 2960 only support dot1Q trunking so we don’t need to specify which trunking encapsulation to use in this case. For Cisco switches 3550 or above we have to use these commands instead: 

Switch3550(config-if)#switchport trunk encapsulation dot1q Switch3550(config-if)#switchport mode trunk 

References: 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. 


Q55. - (Topic 3) 

The command show frame-relay map gives the following output: 

Serial 0 (up): ip 192.168.151.4 dlci 122, dynamic, broadcast, status defined, active 

Which statements represent what is shown?(Choose three.) 

A. 192.168.151.4 represents the IP address of the remote router 

B. 192.168.151.4 represents the IP address of the local serial interface 

C. DLCI 122 represents the interface of the remote serial interface 

D. DLCI 122 represents the local number used to connect to the remote address 

E. broadcast indicates that a dynamic routing protocol such as RIP v1 can send packets across this PVC 

F. active indicates that the ARP process is working 

Answer: A,D,E 

Explanation: 

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


Down to date 200-105 exam prep:

Q56. - (Topic 2) 

Which statement describes the process ID that is used to run OSPF on a router? 

A. It is globally significant and is used to represent the AS number. 

B. It is locally significant and is used to identify an instance of the OSPF database. 

C. It is globally significant and is used to identify OSPF stub areas. 

D. It is locally significant and must be the same throughout an area. 

Answer:

Explanation: The Process ID for OSPF on a router is only locally significant and you can use the same number on each router, or each router can have a different number-it just doesn't matter. The numbers you can use are from 1 to 65,535. Don't get this confused with area numbers, which can be from 0 to 4.2 billion. 


Q57. - (Topic 2) 

Which parameter or parameters are used to calculate OSPF cost in Cisco routers? 

A. Bandwidth 

B. Bandwidth and Delay 

C. Bandwidth, Delay, and MTU 

D. Bandwidth, MTU, Reliability, Delay, and Load 

Answer:

Explanation: 

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

OSPF Cost 

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 sub configuration mode command. 


Q58. - (Topic 3) 

In the Frame Relay network, 

which IP addresses would be assigned to the interfaces with point-to-point PVCs? 

A. DLCI 16 192.168.10.1/24 DLCI 17 192.168.10.1/24 DLCI 99 192.168.10.2/24 DLCI 28 192.168.10.3/24 

B. DLCI 16 192.168.10.1 /24 DLCI 17 192.168.11.1/24 DLCI 99 192.168.12.1/24 DLCI 28 192.168.13.1/24 

C. DLCI 16 192.168.10.1/24 DLCI 17 192.168.11.1/24 DLCI 99 192.168.10.2/24 DLCI 28 192.168.11.2/24 

D. DLCI 16 192.168.10.1/24 DLCI 17 192.168.10.2/24 DLCI 99 192.168.10.3/24 DLCI 28 192.168.10.4/24 

Answer:

Explanation: 

DLCI 16 and DLCI 19 need to act like a point-to-point link and will therefore need to be on the same network as will DLCI 17 and DLCI 28. With this information we can see that option "B" is the only option that has the corresponding DLCI's on the same network based on the ip addresses and subnetmask. Option "D" is incorrect because, this would put the same network on both interfaces of the R2 router. Option "A" is similar. 


Q59. - (Topic 2) 

What are three characteristics of the OSPF routing protocol? (Choose three.) 

A. It converges quickly. 

B. OSPF is a classful routing protocol. 

C. It uses cost to determine the best route. 

D. It uses the DUAL algorithm to determine the best route. 

E. OSPF routers send the complete routing table to all directly attached routers. 

F. OSPF routers discover neighbors before exchanging routing information. 

Answer: A,C,F 

Explanation: 

Open Shortest Path First Reference: 

http://docwiki.cisco.com/wiki/Open_Shortest_Path_First 

Explanation: 

Additional OSPF features include equal-cost, multipath routing, and routing based on upper-layer type-of-service (TOS) requests. TOS-based routing supports those upper-layer protocols that can specify particular types of service. An application, for example, might specify that certain data is urgent. If OSPF has high-priority links at its disposal, these can be used to transport the urgent datagram. 

OSPF supports one or more metrics. If only one metric is used, it is considered to be arbitrary, and TOS is not supported. If more than one metric is used, TOS is optionally supported through the use of a separate metric (and, therefore, a separate routing table) for each of the eight combinations created by the three IP TOS bits (the delay, throughput, and reliability bits). For example, if the IP TOS bits specify low delay, low throughput, and high reliability, OSPF calculates routes to all destinations based on this TOS designation. IP subnet masks are included with each advertised destination, enabling variable-length subnet masks. With variable-length subnet masks, an IP network can be broken into many subnets of various sizes. This provides network administrators with extra network-configuration flexibility. 


Q60. - (Topic 2) 

Refer to Exhibit: 

The internetwork infrastructure of company XYZ consists of a single OSPF area as shown in the graphic. There is concern that a lack of router resources is impeding internetwork performance. As part of examining the router resources, the OSPF DRs need to be known. All the router OSPF priorities are at the default and the router IDs are shown with each router. Which routers are likely to have been elected as DR? (Choose two.) 

A. Corp-1 

B. Corp-2 

C. Corp-3 

D. Corp-4 

E. Branch-1 

F. Branch-2 

Answer: D,F 

Explanation: There are 2 segments on the topology above which are separated by Corp-3 router. Each segment will have a DR so we have 2 DRs. 

To select which router will become DR they will compare their router-IDs. The router with highest (best) router-ID will become DR. The router-ID is chosen in the order below: 

The highest IP address assigned to a loopback (logical) interface. 

If a loopback interface is not defined, the highest IP address of all active router’s physical interfaces will be chosen. 

In this question, the IP addresses of loopback interfaces are not mentioned so we will consider IP addresses of all active router’s physical interfaces. Router Corp-4 (10.1.40.40) 

& Branch-2 (10.2.20.20) have highest “active” IP addresses so they will become DRs.