Cisco 300-101 ExamImplementing Cisco IP Routing

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Q31. Refer to the exhibit. 

Which command only announces the 1.2.3.0/24 network out of FastEthernet 0/0? 

A. distribute list 1 out 

B. distribute list 1 out FastEthernet0/0 

C. distribute list 2 out 

D. distribute list 2 out FastEthernet0/0 

Answer:

Explanation: 

Access list 2 is more specific, allowing only 1.2.3.0/24, whereas access list 1 permits all 1.0.0.0/8

networks. This question also asks us to apply this distribute list only to the outbound direction of the fast Ethernet 0/0 interface, so the correct command is "distribute list 2

out FastEthernet0/0."


Q32. The following configuration is applied to a router at a branch site: 

ipv6 dhcp pool dhcp-pool 

dns-server 2001:DB8:1:B::1 

dns-server 2001:DB8:3:307C::42 

domain-name example.com 

If IPv6 is configured with default settings on all interfaces on the router, which two dynamic IPv6 addressing mechanisms could you use on end hosts to provide end-to-end connectivity? (Choose two.) 

A. EUI-64 

B. SLAAC 

C. DHCPv6 

D. BOOTP 

Answer: A,B 

Explanation: 


Q33. What is a function of NPTv6? 

A. It interferes with encryption of the full IP payload. 

B. It maintains a per-node state. 

C. It is checksum-neutral. 

D. It rewrites transport layer headers. 

Answer:

Explanation: 

RFC 6296 describes a stateless IPv6-to-IPv6 Network Prefix Translation (NPTv6) function,

designed to provide address independence to the edge network. It is transport-agnostic with respect to

transports that do not checksum the IP header, such as SCTP, and to transports that use the TCP/UDP/

DCCP (Datagram Congestion Control Protocol) pseudo-header and checksum NPTv6 provides a simple

and compelling solution to meet the address-independence requirement in IPv6. The addressindependence

benefit stems directly from the translation function of the network prefix translator. To avoid

as many of the issues associated with NAPT44 as possible, NPTv6 is defined to include a two-way,

checksum-neutral, algorithmic translation function, and nothing else. Reference: http://tools.ietf.org/html/

rfc6296


Q34. A network engineer is configuring a solution to allow failover of HSRP nodes during maintenance windows, as an alternative to powering down the active router and letting the network respond accordingly. Which action will allow for manual switching of HSRP nodes? 

A. Track the up/down state of a loopback interface and shut down this interface during maintenance. 

B. Adjust the HSRP priority without the use of preemption. 

C. Disable and enable all active interfaces on the active HSRP node. 

D. Enable HSRPv2 under global configuration, which allows for maintenance mode. 

Answer:

Explanation: 

The standby track command allows you to specify another interface on the router for the

HSRP process to monitor in order to alter the HSRP priority for a given group. If the line protocol of the

specified interface goes down, the HSRP priority is reduced. This means that another HSRP router with

higher priority can become the active router if that router has standby preempt enabled. Loopback

interfaces can be tracked, so when this interface is shut down the HSRP priority for that router will be

lowered and the other HSRP router will then become the active one. Reference: http://www.cisco.com/c/

en/us/support/docs/ip/hot-standby-router-protocol- hsrp/13780-6.html


Q35. What are the three modes of Unicast Reverse Path Forwarding? 

A. strict mode, loose mode, and VRF mode 

B. strict mode, loose mode, and broadcast mode 

C. strict mode, broadcast mode, and VRF mode 

D. broadcast mode, loose mode, and VRF mode 

Answer:

Explanation: 

Network administrators can use Unicast Reverse Path Forwarding (Unicast RPF) to help limit

the malicious traffic on an enterprise network. This security feature works by enabling a router to verify the

reachability of the source address in packets being forwarded. This capability can limit the appearance of

spoofed addresses on a network. If the source IP address is not valid, the packet is discarded. Unicast

RPF works in one of three different modes: strict mode, loose mode, or VRF mode. Note that not all

network devices support all three modes of operation. Unicast RPF in VRF mode will not be covered in this

document. When administrators use Unicast RPF in strict mode, the packet must be received on the

interface that the router would use to forward the return packet. Unicast RPF configured in strict mode may

drop legitimate traffic that is received on an interface that was not the router's choice for sending return

traffic. Dropping this legitimate traffic could occur when asymmetric routing paths are present in the

network. When administrators use Unicast RPF in loose mode, the source address must appear in the

routing table. Administrators can change this behavior using the allow-default option, which allows the use

of the default route in the source verification process. Additionally, a packet that contains a source address

for which the return route points to the Null 0 interface will be dropped. An access list may also be

specified that permits or denies certain source addresses in Unicast RPF loose mode. Care must be taken

to ensure that the appropriate Unicast RPF mode (loose or strict) is configured during the deployment of

this feature because it can drop legitimate traffic. Although asymmetric traffic flows may be of concern

when deploying this feature, Unicast RPF loose mode is a scalable option for networks that contain

asymmetric routing paths. Reference: http://www.cisco.com/web/about/security/intelligence/unicastrpf.

html


Q36. IPv6 has just been deployed to all of the hosts within a network, but not to the servers. Which feature allows IPv6 devices to communicate with IPv4 servers? 

A. NAT 

B. NATng 

C. NAT64 

D. dual-stack NAT 

E. DNS64 

Answer:

Explanation: 

NAT64 is a mechanism to allow IPv6 hosts to communicate with IPv4 servers. The NAT64 server is the

endpoint for at least one IPv4 address and an IPv6 network segment of 32-bits (for instance 64:ff9b::/96, see RFC 6052, RFC 6146). The IPv6 client embeds the IPv4 address it wishes to communicate with using these bits, and sends its packets to the resulting address. The NAT64 server then creates a NAT-mapping between the IPv6 and the IPv4 address, allowing them to communicate.

Reference: http://en.wikipedia.org/wiki/NAT64


Q37. CORRECT TEXT 

You are a network engineer with ROUTE.com, a small IT company. ROUTE.com has two connections to the Internet; one via a frame relay link and one via an EoMPLS link. IT policy requires that all outbound HTTP traffic use the frame relay link when it is available. All other traffic may use either link. No static or default routing is allowed. 

Choose and configure the appropriate path selection feature to accomplish this task. You may use the Test Workstation to generate HTTP traffic to validate your solution. 

Answer: We need to configure policy based routing to send specific traffic along a path that is different from the best path in the routing table. Here are the step by Step Solution for this: 

1) First create the access list that catches the HTTP traffic: R1(config)#access-list 101 permit tcp any any eq www 

2) Configure the route map that sets the next hop address to be ISP1 and permits the rest of the traffic: R1(config)#route-map pbr permit 10 

R1(config-route-map)#match ip address 101 

R1(config-route-map)#set ip next-hop 10.1.100.2 

R1(config-route-map)#exit 

R1(config)#route-map pbr permit 20 

3) Apply the route-map on the interface to the server in the EIGRP Network: 

R1(config-route-map)#exit 

R1(config)#int fa0/1 

R1(config-if)#ip policy route-map pbr 

R1(config-if)#exit 

R1(config)#exit 

Explanation: 

First you need to configure access list to HTTP traffic and then configure that access list. After that configure the route map and then apply it on the interface to the server in EIGRP network. 


Q38. A network engineer is configuring a routed interface to forward broadcasts of UDP 69, 53, and 49 to 172.20.14.225. Which command should be applied to the configuration to allow this? 

A. router(config-if)#ip helper-address 172.20.14.225 

B. router(config-if)#udp helper-address 172.20.14.225 

C. router(config-if)#ip udp helper-address 172.20.14.225 

D. router(config-if)#ip helper-address 172.20.14.225 69 53 49 

Answer:

Explanation: 

To let a router forward broadcast packet the command ip helper-address can be used. The broadcasts will

be forwarded to the unicast address which is specified with the ip helper command.

ip helper-address {ip address}

When configuring the ip helper-address command, the following broadcast packets will be forwarded by

the router by default:

TFTP - UDP port 69

Domain Name System (DNS) UDP port 53

Time service - port 37

NetBIOS Name Server - port 137

NetBIOS Datagram Server - port 138

Bootstrap Protocol (BOOTP) - port 67

TACACS UDP port 49 Reference: http://www.cisco-faq.com/163/forward_udp_broadcas.html

Topic 6, Infrastructure Services 

61. A network engineer is configuring SNMP on network devices to utilize one-way SNMP notifications. However, the engineer is not concerned with authentication or encryption. Which command satisfies the requirements of this scenario? 

A. router(config)#snmp-server host 172.16.201.28 traps version 2c CISCORO 

B. router(config)#snmp-server host 172.16.201.28 informs version 2c CISCORO 

C. router(config)#snmp-server host 172.16.201.28 traps version 3 auth CISCORO 

D. router(config)#snmp-server host 172.16.201.28 informs version 3 auth CISCORO 

Answer:

Explanation: 

Most network admins and engineers are familiar with SNMPv2c which has become the

dominant SNMP version of the past decade. It's simple to configure on both the router/switch-side and just

as easy on the network monitoring server. The problem of course is that the SNMP statistical payload is

not encrypted and authentication is passed in cleartext. Most companies have decided that the information

being transmitted isn't valuable enough to be worth the extra effort in upgrading to SNMPv3, but I would

suggest otherwise. Like IPv4 to IPv6, there are some major changes under the hood. SNMP version 2

uses community strings (think cleartext passwords, no encryption) to authenticate polling and trap delivery.

SNMP version 3 moves away from the community string approach in favor of user- based authentication

and view-based access control. The users are not actual local user accounts, rather they are simply a

means to determine who can authenticate to the device. The view is used to define what the user account

may access on the IOS device. Finally, each user is added to a group, which determines the access policy

for its users. Users, groups, views. Reference: http://www.ccnpguide.com/snmp-version-3/


Q39. Under which condition does UDP dominance occur? 

A. when TCP traffic is in the same class as UDP 

B. when UDP flows are assigned a lower priority queue 

C. when WRED is enabled 

D. when ACLs are in place to block TCP traffic 

Answer:

Explanation: 

Explanation: Mixing TCP with UDP It is a general best practice to not mix TCP-based traffic with UDPbased

traffic (especially Streaming-Video) within a single service-provider class because of the behaviors

of these protocols during periods of congestion. Specifically, TCP transmitters throttle back flows when

drops are detected. Although some UDP applications have application-level windowing, flow control, and

retransmission capabilities, most UDP transmitters are completely oblivious to drops and, thus, never lower

transmission rates because of dropping. When TCP flows are combined with UDP flows within a single

service-provider class and the class experiences congestion, TCP flows continually lower their

transmission rates, potentially giving up their bandwidth to UDP flows that are oblivious to drops. This

effect is called TCP starvation/UDP dominance. TCP starvation/UDP dominance likely occurs if (TCP-based) Mission-Critical Data is assigned to the same service-provider class as (UDP-based) Streaming-

Video and the class experiences sustained congestion. Even if WRED is enabled on the service-provider

class, the same behavior would be observed because WRED (for the most part) manages congestion only

on TCP-based flows. Reference: http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/

WAN_and_MAN/QoS_SRND/QoS- SRND-Book/VPNQoS.html

Topic 2, Layer 2 Technologies 

13. Prior to enabling PPPoE in a virtual private dialup network group, which task must be completed? 

A. Disable CDP on the interface. 

B. Execute the vpdn enable command. 

C. Execute the no switchport command. 

D. Enable QoS FIFO for PPPoE support. 

Answer:

Explanation: 

Enabling PPPoE in a VPDN Group

Perform this task to enable PPPoE in a virtual private dial-up network (VPDN) group.

Restrictions

This task applies only to releases prior to Cisco IOS Release 12.2(13)T.

SUMMARY STEPS

1.enable

2.configure terminal

3.vpdn enable

4.vpdn-group name

5.request-dialin

6.protocol pppoe DETAILED STEPS Command or Action Purpose Step 1 enable Enables privileged EXEC

mode. Example: · Enter your password if Router> enable prompted. Step 2 configure terminal Enters

global configuration mode. Example: Router# configure terminal Step 3 vpdn enable Enables virtual private

dialup Example: networking. Router(config)# vpdn enable Step 4 vpdn-group name Associates a VPDN

group with a Example: customer or VPDN profile. Router(config)# vpdn-group group1 Step 5 request-dialin

Creates a request-dialin VPDN Example: subgroup. Router(config-vpdn)# request-dialin Step 6 protocol

pppoe Enables the VPDN subgroup to Example: establish PPPoE Router(config-vpdn-req-in)# pro tocol

pppoe

Reference:

http://www.cisco.com/en/US/docs/ios/12_2t/12_2t2/feature/guide/ftpppoec_support_TSD_Island

_of_Content_Chapter.html


Q40. A network administrator uses IP SLA to measure UDP performance and notices that packets on one router have a higher one-way delay compared to the opposite direction. Which UDP characteristic does this scenario describe? 

A. latency 

B. starvation 

C. connectionless communication 

D. nonsequencing unordered packets 

E. jitter 

Answer:

Explanation: 

Cisco IOS IP SLAs provides a proactive notification feature with an SNMP trap. Each measurement

operation can monitor against a pre-set performance threshold.

Cisco IOS IP SLAs generates an SNMP trap to alert management applications if this threshold is crossed.

Several SNMP traps are available: round trip time, average jitter, one-way latency, jitter, packet loss, MOS, and connectivity tests.

Here is a partial sample output from the IP SLA statistics that can be seen:

router#show ip sla statistics 1

Round Trip Time (RTT) for Index 55

Latest RTT: 1 ms

Latest operation start time: *23:43:31.845 UTC Thu Feb 3 2005 Latest operation return code: OK

RTT Values:

Number Of RTT: 10 RTT Min/Avg/Max: 1/1/1 milliseconds Latency one-way time:

Number of Latency one-way Samples: 0

Source to Destination Latency one way Min/Avg/Max: 0/0/0 milliseconds Destination to Source Latency

one way Min/Avg/Max: 0/0/0 milliseconds 

Reference:

http://www.cisco.com/en/US/technologies/tk648/tk362/tk920/technologies_white_paper09186a0

0802d5efe.html


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