Cisco 200-101 Online Practice Questions and Exam Preparation

Cisco 200-101 Online Questions & Answers

• Question 101:

  Which command is used to display the collection of OSPF link states?

  A. show ip ospf link-state
  B. show ip ospf lsa database
  C. show ip ospf neighbors
  D. show ip ospf database
  D. show ip ospf database

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  http://www.cisco.com/en/US/docs/ios/iproute_ospf/command/reference/iro_osp3.html#wp101217

  Examples

  The following is sample output from the show ip ospf database command when no arguments or keywords are used:

  Router# show ip ospf database

  OSPF Router with id(192.168.239.66) (Process ID 300)

  

• Question 102:

  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
  C. 10.0.0.0/8
  E. 172.16.0.0/16
  F. 192.168.1.0/24

• Question 103:

  The network administrator has been asked to give reasons for moving from IPv4 to IPv6. What are two valid reasons for adopting IPv6 over IPv4? (Choose two.)

  A. no broadcast
  B. change of source address in the IPv6 header
  C. change of destination address in the IPv6 header
  D. Telnet access does not require a password
  E. autoconfig
  F. NAT
  A. no broadcast
  E. autoconfig

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  Six Benefits Of IPv6 http://www.networkcomputing.com/ipv6/six-benefits-of-ipv6/230500009

  With IPv6, everything from appliances to automobiles can be interconnected. But an increased number of IT addresses isn't the only advantage of IPv6 over IPv4. In honor of World IPv6 Day, here are six more good reasons to make sure your hardware, software, and services support IPv6. More Efficient Routing IPv6 reduces the size of routing tables and makes routing more efficient and hierarchical. IPv6 allows ISPs to aggregate the prefixes of their customers' networks into a single prefix and announce this one prefix to the IPv6 Internet. In addition, in IPv6 networks, fragmentation is handled by the source device, rather than the router, using a protocol for discovery of the path's maximum transmission unit (MTU).

  More Efficient Packet Processing IPv6's simplified packet header makes packet processing more efficient. Compared with IPv4, IPv6 contains no IP-level checksum, so the checksum does not need to be recalculated at every router hop. Getting rid of the IPlevel checksum was possible because most link-layer technologies already contain checksum and error-control capabilities. In addition, most transport layers, which handle end-to-end connectivity, have a checksum that enables error detection. Directed Data Flows IPv6 supports multicast rather than broadcast. Multicast allows bandwidth- intensive packet flows (like multimedia streams) to be sent to multiple destinations simultaneously, saving network bandwidth. Disinterested hosts no longer must process broadcast packets. In addition, the IPv6 header has a new field, named Flow Label, that can identify packets belonging to the same flow. Simplified Network Configuration Address auto-configuration (address assignment) is built in to IPv6. A router will send the prefix of the local link in its router advertisements. A host can generate its own IP address by appending its link-layer (MAC) address, converted into Extended Universal Identifier (EUI) 64-bit format, to the 64 bits of the local link prefix.

  Support For New Services By eliminating Network Address Translation (NAT), true end-to-end connectivity at the IP layer is restored, enabling new and valuable services. Peer-to-peer networks are easier to create and maintain, and services such as VoIP and Quality of Service (QoS) become more robust. Security IPSec, which provides confidentiality, authentication and data integrity, is baked into in IPv6. Because of their potential to carry malware, IPv4 ICMP packets are often blocked by corporate firewalls, but ICMPv6, the implementation of the Internet Control Message Protocol for IPv6, may be permitted because IPSec can be applied to the ICMPv6 packets.

• Question 104:

  Which two states are the port states when RSTP has converged? (Choose two.)

  A. discarding
  B. listening
  C. learning
  D. forwarding
  E. disabled
  A. discarding
  D. forwarding

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  Understanding Rapid Spanning Tree Protocol (802.1w)

  http://www.cisco.com/en/US/tech/tk389/tk621/technologies_white_paper09186a0080094cfa.shtml

  Port States

  There are only three port states left in RSTP that correspond to the three possible operational states. The 802.1D disabled, blocking, and listening states are merged into a unique 802.1w discarding state.

  RSTP only has 3 port states which are discarding, learning and forwarding. When RSTP has converged there are only 2 port states left: discarding and forwarding.

  

• Question 105:

  What is the purpose of Inverse ARP?

  A. to map a known IP address to a MAC address
  B. to map a known DLCI to a MAC address
  C. to map a known MAC address to an IP address
  D. to map a known DLCI to an IP address
  E. to map a known IP address to a SPID
  F. to map a known SPID to a MAC address
  D. to map a known DLCI to an IP address

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  http://www.ciscopress.com/articles/article.asp?p=170741andseqNum=4

  Frame-Relay (a Layer 2 protocol) uses Inverse-Arp to map a know Layer 2 Address (DLCI) to a unknow Layer 3 Address. Dynamic Mapping Dynamic address mapping relies on the Frame Relay Inverse Address Resolution Protocol (Inverse ARP), defined by RFC 1293, to resolve a next hop network protocol address to a local DLCI value. The Frame Relay router sends out Inverse ARP requests on its Frame Relay PVC to discover the protocol address of the remote device connected to the Frame Relay network. The responses to the Inverse ARP requests are used to populate an address-to-DLCI mapping table on the Frame Relay router or access server. The router builds and maintains this address-to-DLCI mapping table, which contains all resolved Inverse ARP requests, including both dynamic and static mapping entries. When data needs to be transmitted to a remote destination address, the router performs a lookup on its routing table to determine whether a route to that destination address exists and the next hop address or directly connected interface to use in order to reach that destination. Subsequently, the router consults its address-to-DLCI mapping table for the local DLCI that corresponds to the next hop address. Finally, the router places the frames targeted to the remote destination on its identified outgoing local DLCI. On Cisco routers, dynamic Inverse ARP is enabled by default for all network layer protocols enabled on the physical interface. Packets are not sent out for network layer protocols that are not enabled on the physical interface. For example, no dynamic Inverse ARP resolution is performed for IPX if ipx routing is not enabled globally and there is no active IPX address assigned to the interface. Because dynamic Inverse ARP is enabled by default, no additional Cisco IOS command is required to enable it on an interface. Example 4-16 shows the output of the show frame-relay map privileged EXEC mode command. The addressto-DLCI mapping table displays useful information. The output of the command shows that the next hop address 172.16.1.2 is dynamically mapped to the local DLCI 102, broadcast is enabled on the interface, and the interface's status is currently active.

  NOTE After enabling Frame Relay on the interface, the Cisco router does not perform Inverse ARP until IP routing is enabled on the router. By default, IP routing is enabled on a Cisco router. If IP routing has been turned off, enable IP routing with

  the ip routing command in the global configuration mode. After IP routing is enabled, the router performs Inverse ARP and begins populating the address-to-DLCI mapping table with resolved entries.

• Question 106:

  What is the default administrative distance of OSPF?

  A. 90
  B. 100
  C. 110
  D. 120
  C. 110

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  Default Distance Value Table

  This table lists the administrative distance default values of the protocols that Cisco supports:

  

• Question 107:

  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
  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

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  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.

• Question 108:

  A network administrator needs to configure a serial link between the main office and a remote location. The router at the remote office is a non-Cisco router. How should the network administrator configure the serial interface of the main office router to make the connection?

  A. Main(config)# interface serial 0/0 Main(config-if)# ip address 172.16.1.1 255.255.255.252 Main(config-if)# no shut
  B. Main(config)# interface serial 0/0 Main(config-if)# ip address 172.16.1.1 255.255.255.252 Main(config-if)# encapsulation ppp Main(config-if)# no shut
  C. Main(config)# interface serial 0/0 Main(config-if)# ip address 172.16.1.1 255.255.255.252 Main(config-if)# encapsulation frame-relay Main(config-if)# authentication chap Main(config-if)# no shut
  D. Main(config)# interface serial 0/0 Main(config-if)#ip address 172.16.1.1 255.255.255.252 Main(config-if)#encapsulation ietf Main(config-if)# no shut
  B. Main(config)# interface serial 0/0 Main(config-if)# ip address 172.16.1.1 255.255.255.252 Main(config-if)# encapsulation ppp Main(config-if)# no shut

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  Cisco High-Level Data Link Controller (HDLC) is the Cisco proprietary protocol for sending data over synchronous serial links using HDLC. So HDLC runs only in Cisco router. PPP is not proprietary protocol it's a open source every cisco router and non-cisco router understand the PPP protocol.So we need to configure the PPP protocol if connection is between cisco and non- cisco router.

• Question 109:

  What OSPF command, when configured, will include all interfaces into area 0?

  A. network 0.0.0.0 255.255.255.255 area 0
  B. network 0.0.0.0 0.0.0.0 area 0
  C. network 255.255.255.255 0.0.0.0 area 0
  D. network all-interfaces area 0
  A. network 0.0.0.0 255.255.255.255 area 0

• Question 110:

  

  R1 is configured with the default configuration of OSPF.

  From the following list of IP addresses configured on R1, which address will the OSPF process select as the router ID?

  A. 192.168.0.1
  B. 172.16.1.1
  C. 172.16.2.1
  D. 172.16.2.225
  A. 192.168.0.1

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  The Router ID (RID) is an IP address used to identify the router and is chosen using the following sequence:

  +

  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.

  +

  The router ID can be manually assigned

  In this case, because a loopback interface is not configured so the highest active IP address 192.168.0.1 is chosen as the router ID.