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Cisco 642-902

Implementing Cisco IP Routing

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Cisco 642-902

Implementing Cisco IP Routing

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    Cisco 642-902 (Implementing Cisco IP Routing)

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642-902 Questions and Answers

642-902

E. uses Virtual Tunnel Interface (VTI) to simplify the IPsec VPN configuration


Answer: A, D


Reference:

ptgmedia.pearsoncmg.com/images/9781587201509/samplechapter/158720150X

_CH14.pdf (page 332)


QUESTION: 147

Which statement is true about an IPsec/GRE tunnel?


  1. The GRE tunnel source and destination addresses are specified within the IPsec transform set.

  2. An IPsec/GRE tunnel must use IPsec tunnel mode.

  3. GRE encapsulation occurs before the IPsec encryption process.

  4. Crypto map ACL is not needed to match which traffic will be protected.


Answer: C


Reference:

www.cisco.com/en/US/ts/fn/620/fn62394.html


QUESTION: 148

Which of the following is a GRE Tunnel characteristic?


  1. GRE impose more CPU overhead than IPSec on VPN gateways

  2. GRE tunnels can run through IPsec tunnels.

  3. GRE Tunnel doesn't have support for IPv6

  4. GRE consists of two sub-protocols: Encapsulated Security Payload (ESP) and Authentication Header (AH).


Answer: B


Explanation:

If you run an IPsec tunnel through a GRE tunnel then we call it as "IPsec over GRE"


QUESTION: 149

What are the four main steps in configuring a GRE tunnel over IPsec on Cisco routers? (Choose Four)


  1. Configure a physical interface or create a loopback interface to use as the tunnel endpoint.

  2. Create the GRE tunnel interfaces.

  3. Add the tunnel interfaces to the routing process so that it exchanages routing updates across that interface.

  4. Add the tunnel subnet to the routing process so that it exchanages routing updates across that interface.

  5. Add all subnets to the crypto access-list, so that IPsec encrypts the GRE tunnel traffic.

  6. Add GRE traffic to the crypto access-list, so that IPsec encrypts the GRE tunnel traffic.


Answer: A, B, D, F


Reference: www.cisco.com/public/technotes/smbsa/en/us/internet/Sec_GRE_tunnel_ovr_IP SEC. pdf


QUESTION: 150

A network administrator uses GRE over IPSec to connect two branches together via VPN tunnel. Which one of the following is the reason for using GRE over IPSec?


  1. GRE over IPSec provides better QoS mechanism and is faster than other WAN technologies.

  2. GRE over IPSec decreases the overhead of the header.

  3. GRE supports use of routing protocol, while IPSec supports encryption.

  4. GRE supports encryption, while IPSec supports use of routing protocol.


Answer: C


Reference:

www.dslreports.com/faq/8228 (4th para)


QUESTION: 151

When policy-based routing (PBR) is being configured,


Which three criteria can the set command specify? (Choose three.)


  1. all interfaces through which the packets can be routed

  2. all interfaces in the path toward the destination

  3. adjacent next hop router in the path toward the destination

  4. all routers in the path toward the destination

  5. all networks in the path toward the destination

  6. type of service and precedence in the IP packets


Answer: A, C, F


Explanation:

Configuring Policy-Based Routing (PBR):

You can configure PBR by following these steps. Some of the steps may be omitted depending on your application for PBR. For this example, note the set condition options listed is step 3 (answers are bolded).

Step1

Define and configure the route map needed for the policy. This is accomplished with the route-map command, as discussed previously.

Step2

Define and configure the match statements the route map will use. The most common match statements used are the following:

match ip address [access-list number]

The match ip address is used to call a standard, extended, or expanded-range ACL. match length [min_packet_length_0-2147483647] [max_packet_length_0- 2147483647] The match length is used to match the Layer 3 packet length, in bytes, with all associated headers and trailers included. You must enter the minimum and maximum packet length. Use the match length command to policy route traffic based on packet size. You can deploy this to route traffic with large or small packet sizes to specific areas of the network. Step3

Configure and define the new routing policy with set commands. Multiple set commands may be used; if multiple commands are used, they are executed in the following order:

set ip {precedence [value_0-7 | name] | tos [value_0-8 | name]} set ip next-hop ip_address

set interface interface_name

set ip default next-hop ip_address set default interface interface_name

Set ip precedence {[1-7]|[routine|critical|flash|flash- override|immediate|internet|network|priority]}


Reference:

www.ciscopress.com/articles/article.asp?p=102092&rl=1


QUESTION: 152

Router R1, a branch router, connects to the Internet using DSL. Some traffic flows through a GRE and IPsec tunnel, over the DSL connection, destined for an Enterprise network. Which of the following answers best describes the router’s logic that tells the router, for a given packet, to apply GRE encapsulation to the packet?


  1. When the packet received on the LAN interface is permitted by the ACL listed on the tunnel gre acl command under the incoming interface

  2. When routing the packet, matching a route whose outgoing interface is the GRE tunnel interface

  3. When routing the packet, matching a route whose outgoing interface is the IPsec tunnel interface

  4. When permitted by an ACL that was referenced in the associated crypto map


Answer: B


Explanation:

As for the correct answer, the process of routing a packet out a GRE tunnel interface triggers the GRE encapsulation action. As for the incorrect answers: There is no tunnel gre acl command. There is no IPsec tunnel interface. Finally, one answer refers to logic that would describe a router’s logic when determining whether to encapsulate a packet into an IPsec tunnel.


QUESTION: 153

Router R1, a branch router, connects to the Internet using DSL. Some traffic flows through a GRE and IPsec tunnel, over the DSL connection, and into the core of an Enterprise network. The branch also allows local hosts to communicate directly with public sites in the Internet over this same DSL connection. Which of the following answers defines how the branch NAT config avoids performing NAT for the Enterprise directed traffic but does perform NAT for the Internet-directed traffic?


  1. By not enabling NAT on the IPsec tunnel interface

  2. By not enabling NAT on the GRE tunnel interface

  3. By configuring the NAT-referenced ACL to not permit the Enterprise traffic

  4. By asking the ISP to perform NAT in the cloud


Answer: C


Explanation:

The NAT configuration acts only on packets permitted by a referenced ACL. As a result, the ACL can permit packets destined for the Internet, performing NAT on those packets. The ACL also denies packets going to the Enterprise, meaning that the router does not apply NAT to those packets.

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