Advanced Guide: cisco 200 105

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Q11. – (Topic 3) 

Refer to the exhibit. 

The show interfaces serial 0/1 command was issued on the R10-1 router. Based on the output displayed which statement is correct? 

A. The cable connected to the serial 0/1 interface of the R10-1 router is a DTE cable. 

B. The R10-1 router can ping the router interface connected to the serial 0/1 interface. 

C. The clock rate used for interface serial 0/1 of the R10-1 router is 1,544,000 bits per second. 

D. The CSU used with the serial 0/1 interface of the R10-1 router has lost connection to the service provider. 

E. The interface of the remote router connected to the serial 0/1 interface of the R10-1 router is using the default serial interface encapsulation. 

Answer:

Explanation: 

Cisco High-Level Data Link Controller (HDLC) is the Cisco proprietary protocol for Cisco HDLC is the default encapsulation type for the serial interfaces. 

Q12. – (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. 

Q13. – (Topic 2) 

Refer to the exhibit. 

Assume that all router interfaces are operational and correctly configured. In addition, assume that OSPF has been correctly configured on router R2. How will the default route configured on R1 affect the operation of R2? 

A. Any packet destined for a network that is not directly connected to router R1 will be dropped. 

B. Any packet destined for a network that is not directly connected to router R2 will be dropped immediately. 

C. Any packet destined for a network that is not directly connected to router R2 will be dropped immediately because of the lack of a gateway on R1. 

D. The networks directly connected to router R2 will not be able to communicate with the 172.16.100.0, 172.16.100.128, and 172.16.100.64 subnetworks. 

E. Any packet destined for a network that is not referenced in the routing table of router R2 will be directed to R1. R1 will then send that packet back to R2 and a routing loop will occur. 

Answer:

Explanation: 

First, notice that the more-specific routes will always be favored over less-specific routes regardless of the administrative distance set for a protocol. In this case, because we use OSPF for three networks (172.16.100.0 0.0.0.3, 172.16.100.64 0.0.0.63, 172.16.100.128 0.0.0.31) so the packets destined for these networks will not be affected by the default route. The default route configured on R1 "ip route 0.0.0.0 0.0.0.0 serial0/0 will send any packet whose destination network is not referenced in the routing table of router R1 to R2, it doesn't drop anything so answers A, B and C are not correct. D is not correct too because these routes are declared in R1 and the question says that "OSPF has been correctly configured on router R2, so network directly connected to router R2 can communicate with those three subnetworks. As said above, the default route configured on R1 will send any packet destined for a network that is not referenced in its routing table to 

R2; R2 in turn sends it to R1 because it is the only way and a routing loop will occur. 

Q14. – (Topic 2) 

Refer to the exhibit. 

The network associate is configuring OSPF on the Core router. All the connections to the branches should be participating in OSPF. The link to the ISP should NOT participate in OSPF and should only be advertised as the default route. What set of commands will properly configure the Core router? 

A. Core(config-router)# default-information originate Core(config-router)# network 10.0.0.0 0.255.255.255 area 0 Core(config-router)# exit Core(config)# ip route 0.0.0.0 0.0.0.0 10.10.2.14 

B. Core(config-router)# default-information originate Core(config-router)# network 10.10.2.13 0.0.0.242 area 0 Core(config-router)# exit Core(config)# ip route 0.0.0.0 0.0.0.0 10.10.2.14 

C. Core(config-router)# default-information originate Core(config-router)# network 10.10.2.16 0.0.0.15 area 0 Core(config-router)# exit Core(config)# ip route 0.0.0.0 0.0.0.0 10.10.2.14 

D. Core(config-router)# default-information originate Core(config-router)# network 10.10.2.32 0.0.0.31 area 0 Core(config-router)# exit Core(config)# ip route 0.0.0.0 0.0.0.0 10.10.2.14 

Answer:

Explanation: 

There are two ways to inject a default route into a normal area.1. If the ASBR already has the default route in its routing table, you can advertise theexisting 0.0.0.0/0 into the OSPF domain with the default-information originate router configuration command.2. If the ASBR doesn’t have a default route, you can add the keyword always to the default-information originate command (default-information originate always).This command will advertise a default route into the OSPF domain, regardless of whether it has a route to 0.0.0.0. Another benefit of adding always keyword is that it can add stability to the internetwork. For example, if the ASBR is learning a default route from another routing domain such as RIP and this route is flapping, then without the always keyword, each time the route flaps, the ASBR will send a new Type 5 LSA into the OSPF domain causing some instability inside the OSPF domain. With the always keyword, the ASBR will advertise the default inside the OSPF domain always, In the example shown here, only choice C is correct as the wildcard mask correctly specifies the 10.10.2.16 0.0.0.15 networks, which include all IP addresses in the 10.10.2.16-10.10.2.31 range. In this question we were told that the ISP link should NOT be configured for OSPF, making choice A incorrect. http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00801 ec9f0.shtml 

Q15. – (Topic 3) 

Refer to the exhibit. 

A network associate has configured OSPF with the command: City(config-router)# network 192.168.12.64 0.0.0.63 area 0 After completing the configuration, the associate discovers that not all the interfaces are participating in OSPF. Which three of the interfaces shown in the exhibit will participate in OSPF according to this configuration statement? (Choose three.) 

A. FastEthernet0 /0 

B. FastEthernet0 /1 

C. Serial0/0 

D. Serial0/1.102 

E. Serial0/1.103 

F. Serial0/1.104 

Answer: B,C,D 

Explanation: 

The “network 192.168.12.64 0.0.0.63 equals to network 192.168.12.64/26. This network has:Increment: 64 (/26= 1111 1111.1111 1111.1111 1111.1100 0000)Network address: 

192.168.12.64 Broadcast address: 192.168.12.127Therefore all interface in the range of this network will join OSPF – B C D are correct. 

Q16. – (Topic 1) 

Which three statements are typical characteristics of VLAN arrangements? (Choose three.) 

A. A new switch has no VLANs configured. 

B. Connectivity between VLANs requires a Layer 3 device. 

C. VLANs typically decrease the number of collision domains. 

D. Each VLAN uses a separate address space. 

E. A switch maintains a separate bridging table for each VLAN. 

F. VLANs cannot span multiple switches. 

Answer: B,D,E 

Explanation: 

By default, all ports on a new switch belong to VLAN 1 (default & native VLAN). There are also some well-known VLANs (for example: VLAN 1002 for fddi-default; VLAN 1003 for token-ring…) configured by default -> A is not correct. To communicate between two different VLANs we need to use a Layer 3 device like router or Layer 3 switch -> B is correct. VLANs don’t affect the number of collision domains, they are the same -> C is not correct. Typically, VLANs increase the number of broadcast domains.We must use a different network (or sub-network) for each VLAN. For example we can use 192.168.1.0/24 for VLAN 1, 192.168.2.0/24 for VLAN 2 -> D is correct. A switch maintains a separate bridging table for each VLAN so that it can send frame to 

ports on the same VLAN only. For example, if a PC in VLAN 2 sends a frame then the 

switch look-ups its bridging table and only sends frame out of its ports which belong to 

VLAN 2 (it also sends this frame on trunk ports) -> E is correct. 

We can use multiple switches to expand VLAN -> F is not correct. 

Q17. – (Topic 3) 

Which PPP subprotocol negotiates authentication options? 

A. NCP 

B. ISDN 

C. SLIP 

D. LCP 

E. DLCI 

Answer:

Explanation: 

A protocol that establishes, configures, and tests data link connections used by the PPP Link Control Protocol offers PPP encapsulation different options, including the following: Authentication – options includes PAP and CHAP Compression – Data compression increases the throughput on a network link, by reducing the amount of data that must be transmitted. Error Detection -Quality and Magic numbers are used by PPP to ensure a reliable, loop-free data link. Multilink – Supported in IOS 11.1 and later, multilink is supported on PPP links between Cisco routers. This splits the load for PPP over two or more parallel circuits and is called a bundle. 

Q18. – (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 

Q19. – (Topic 2) 

Refer to the exhibit. 

What information about the interfaces on the Main_Campus router is true? 

A. The LAN interfaces are configured on different subnets. 

B. Interface FastEthernet 0/0 is configured as a trunk. 

C. The Layer 2 protocol of interface Serial 0/1 is NOT operational. 

D. The router is a modular router with five FastEthernet interfaces. 

E. Interface FastEthernet 0/0 is administratively deactivated. 

Answer:

Explanation: 

Interface fa0/0 breaks into sub-interfaces and Main_Campus router is connected with switch via fa0/0 .Subinterfaces configured with different subnet masks so the same switch has multiple vlans and allows communication between these VLAN's. For routing and inter-vlan we need to configure a trunk port. So B will be the correct answer. 

Q20. – (Topic 2) 

Refer to the exhibit. 

Which three EIGRP routes will be present in the router R4's routing table? (Choose three.) 

A. 172.16.1.0/24 

B. 10.1.10.0/30 

C. 10.0.0.0/8 

D. 10.1.11.0/30 

E. 172.16.0.0/16 

F. 192.168.1.0/24 

Answer: C,E,F 

Explanation: 

EIGRP performs an auto-summarization each time it crosses a border between two different major networks, so when R2 advertises the routes to R4 it will advertise only the summarized routes of 10.0.0.0/8 and 172.16.0.0/16, along with the 192.168.1.0/24 route coming from R3. 

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