ccnp routing and switching route 300-101 pdf [May 2016]


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300-101 Product Description:
Exam Number/Code: 300-101 vce
Exam name: Implementing Cisco IP Routing
n questions with full explanations
Certification: Cisco Certification
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Exam Code: 300-101 (Practice Exam Latest Test Questions VCE PDF)
Exam Name: Implementing Cisco IP Routing
Certification Provider: Cisco
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2016 May 300-101 Study Guide Questions:

Q21. Which switching method is used when entries are present in the output of the command show ip cache? 

A. fast switching 

B. process switching 

C. Cisco Express Forwarding switching 

D. cut-through packet switching 

Answer: A 

Explanation: 

Fast switching allows higher throughput by switching a packet using a cache created by the initial packet

sent to a particular destination. Destination addresses are stored in the high-speed cache to expedite forwarding. Routers offer better packet-transfer performance when fast switching is enabled. Fast switching is enabled by default on all interfaces that support fast switching.

To display the routing table cache used to fast switch IP traffic, use the "show ip cache" EXEC command.

Reference:

http://www.cisco.com/c/en/us/td/docs/ios/12_2/switch/command/reference/fswtch_r/xrfscmd5.ht

ml#wp1038133


Q22. Which three TCP enhancements can be used with TCP selective acknowledgments? (Choose three.) 

A. header compression 

B. explicit congestion notification 

C. keepalive 

D. time stamps 

E. TCP path discovery 

F. MTU window 

Answer: B,C,D 

Explanation: 

TCP Selective Acknowledgment

The TCP Selective Acknowledgment feature improves performance if multiple packets are lost from one

TCP window of data.

Prior to this feature, because of limited information available from cumulative acknowledgments, a TCP

sender could learn about only one lost packet per-round-trip

time. An aggressive sender could choose to resend packets early, but such re-sent segments might have

already been successfully received.

The TCP selective acknowledgment mechanism helps improve performance. The receiving TCP host

returns selective acknowledgment packets to the sender,

informing the sender of data that has been received. In other words, the receiver can acknowledge packets

received out of order. The sender can then resend only

missing data segments (instead of everything since the first missing packet).

Prior to selective acknowledgment, if TCP lost packets 4 and 7 out of an 8-packet window, TCP would

receive acknowledgment of only packets 1, 2, and 3. Packets

4 through 8 would need to be re-sent. With selective acknowledgment, TCP receives acknowledgment of

packets 1, 2, 3, 5, 6, and 8. Only packets 4 and 7 must be

re-sent.

TCP selective acknowledgment is used only when multiple packets are dropped within one TCP window.

There is no performance impact when the feature is

enabled but not used. Use the ip tcp selective-ack command in global configuration mode to enable TCP

selective acknowledgment.

Refer to RFC 2018 for more details about TCP selective acknowledgment.

TCP Time Stamp

The TCP time-stamp option provides improved TCP round-trip time measurements. Because the time

stamps are always sent and echoed in both directions and the time-stamp value in the header is always

changing, TCP header compression will not compress the outgoing packet. To allow TCP header

compression over a serial link, the TCP time-stamp option is disabled. Use the ip tcp timestamp command

to enable the TCP time-stamp option.

TCP Explicit Congestion Notification

The TCP Explicit Congestion Notification (ECN) feature allows an intermediate router to notify end hosts of

impending network congestion. It also provides enhanced support for TCP sessions associated with

applications, such as Telnet, web browsing, and transfer of audio and video data that are sensitive to delay

or packet loss. The benefit of this feature is the reduction of delay and packet loss in data transmissions.

Use the ip tcp ecn command in global configuration mode to enable TCP ECN.

TCP Keepalive Timer

The TCP Keepalive Timer feature provides a mechanism to identify dead connections. When a TCP

connection on a routing device is idle for too long, the device sends a TCP keepalive packet to the peer

with only the Acknowledgment (ACK) flag turned on. If a response packet (a TCP ACK packet) is not

received after the device sends a specific number of probes, the connection is considered dead and the

device initiating the probes frees resources used by the TCP connection. Reference: http://www.cisco.com/

c/en/us/td/docs/ios-xml/ios/ipapp/configuration/xe-3s/asr1000/iap-xe-3s-asr1000-book/iap-tcp.html#GUID-22A82C5F-631F-4390-9838-F2E48FFEEA01


Q23. What is the purpose of the autonomous-system {autonomous-system-number} command? 

A. It sets the EIGRP autonomous system number in a VRF. 

B. It sets the BGP autonomous system number in a VRF. 

C. It sets the global EIGRP autonomous system number. 

D. It sets the global BGP autonomous system number. 

Answer: A 

Explanation: 

To configure the autonomous-system number for an Enhanced Interior Gateway Routing

Protocol (EIGRP) routing process to run within a VPN routing and forwarding (VRF) instance, use the

autonomous-system command in address-family configuration mode. To remove the autonomous-system

for an EIGRP routing process from within a VPN VRF instance, use the no form of this command.

autonomous-system autonomous-system-number no autonomous-system autonomous-system-number

Reference: http://www.cisco.com/c/en/us/td/docs/ios/iproute_eigrp/command/reference/ire_book/

ire_a1.htm l#wp1062796


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Q24. An engineer has configured a router to use EUI-64, and was asked to document the IPv6 address of the router. The router has the following interface parameters: 

mac address C601.420F.0007 

subnet 2001:DB8:0:1::/64 

Which IPv6 addresses should the engineer add to the documentation? 

A. 2001:DB8:0:1:C601:42FF:FE0F:7 

B. 2001:DB8:0:1:FFFF:C601:420F:7 

C. 2001:DB8:0:1:FE80:C601:420F:7 

D. 2001:DB8:0:1:C601:42FE:800F:7 

Answer: A 

Explanation: 

Explanation: Extended Unique Identifier (EUI), as per RFC2373, allows a host to assign iteslf a unique 64-

Bit IP Version 6 interface identifier (EUI-64). This feature is a key benefit over IPv4 as it eliminates the

need of manual configuration or DHCP as in the world of IPv4. The IPv6 EUI-64 format address is obtained

through the 48-bit MAC address. The Mac address is first separated into two 24-bits, with one being OUI

(Organizationally Unique Identifier) and the other being NIC specific. The 16-bit 0xFFFE is then inserted

between these two 24-bits to for the 64-bit EUI address. IEEE has chosen FFFE as a reserved value which

can only appear in EUI-64 generated from the EUI-48 MAC address. Here is an example showing how the

Mac Address is used to generate EUI.


Next, the seventh bit from the left, or the universal/local (U/L) bit, needs to be inverted. This bit identifies

whether this interface identifier is universally or locally administered. If 0, the address is locally

administered and if 1, the address is globally unique. It is worth noticing that in the OUI portion, the globally

unique addresses assigned by the IEEE has always been set to 0 whereas the locally created addresses

has 1 configured. Therefore, when the bit is inverted, it maintains its original scope (global unique address

is still global unique and vice versa). The reason for inverting can be found in RFC4291 section 2.5.1.

Reference: https:// supportforums.cisco.com/document/100566/understanding-ipv6-eui-64-bit- address


Q25. You have been asked to evaluate how EIGRP is functioning in a customer network. 








What percent of R1’s interfaces bandwidth is EIGRP allowed to use? 

A. 10 

B. 20 

C. 30 

D. 40 

Answer: B 

Explanation: 


Q26. A network engineer finds that a core router has crashed without warning. In this situation, which feature can the engineer use to create a crash collection? 

A. secure copy protocol 

B. core dumps 

C. warm reloads 

D. SNMP 

E. NetFlow 

Answer: B 

Explanation: 

When a router crashes, it is sometimes useful to obtain a full copy of the memory image (called a core

dump) to identify the cause of the crash. Core dumps are generally very useful to your technical support representative.

Four basic ways exist for setting up the router to generate a core dump:

Using Trivial File Transfer Protocol (TFTP)

Using File Transfer Protocol (FTP)

Using remote copy protocol (rcp)

Using a Flash disk Reference: http://www.cisco.com/en/US/docs/internetworking/troubleshooting/guide/

tr19aa.html


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Q27. A network engineer has left a NetFlow capture enabled over the weekend to gather information regarding excessive bandwidth utilization. The following command is entered: 

switch#show flow exporter Flow_Exporter-1 What is the expected output? 

A. configuration of the specified flow exporter 

B. current status of the specified flow exporter 

C. status and statistics of the specified flow monitor 

D. configuration of the specified flow monitor 

Answer: B 

Explanation: 

show flow exporter exporter-name (Optional) Displays the current status of the specified flow exporter.

Example:

Device# show flow exporter

FLOW_EXPORTER-1

Reference: http://www.cisco.com/en/US/docs/ios-xml/ios/fnetflow/configuration/15-mt/cfg-de- fnflowexprts.

html


Q28. Refer to the exhibit. Which statement about the configuration is true? 


A. 20 packets are being sent every 30 seconds. 

B. The monitor starts at 12:05:00 a.m. 

C. Jitter is being tested with TCP packets to port 65051. 

D. The packets that are being sent use DSCP EF. 

Answer: A 

Explanation: 


Q29. Which traffic characteristic is the reason that UDP traffic that carries voice and video is assigned to the queue only on a link that is at least 768 kbps? 

A. typically is not fragmented 

B. typically is fragmented 

C. causes windowing 

D. causes excessive delays for video traffic 

Answer: A 

Explanation: 


Q30. Which statement about dual stack is true? 

A. Dual stack translates IPv6 addresses to IPv4 addresses. 

B. Dual stack means that devices are able to run IPv4 and IPv6 in parallel. 

C. Dual stack translates IPv4 addresses to IPv6 addresses. 

D. Dual stack changes the IP addresses on hosts from IPv4 to IPv6 automatically. 

Answer: B 

Explanation: 



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