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2021 Dec pdf ccnp route 300-101:

Q1. You have been asked to evaluate how EIGRP is functioning in a customer network. 

Traffic from R1 to R61 s Loopback address is load shared between R1-R2-R4-R6 and R1-R3-R5-R6 paths. What is the ratio of traffic over each path? 

A. 1:1 

B. 1:5 

C. 6:8 

D. 19:80 

Answer:

Explanation: 


Q2. When using SNMPv3 with NoAuthNoPriv, which string is matched for authentication? 

A. username 

B. password 

C. community-string 

D. encryption-key 

Answer:

Explanation: 

The following security models exist: SNMPv1, SNMPv2, SNMPv3. The following security

levels exits: "noAuthNoPriv" (no authentiation and no encryption noauth keyword in CLI),

"AuthNoPriv" (messages are authenticated but not encrypted auth keyword in CLI), "AuthPriv" (messages

are authenticated and encrypted priv keyword in CLI). SNMPv1 and SNMPv2 models only support the

"noAuthNoPriv" model since they use plain community string to match the incoming packets. The SNMPv3

implementations could be configured to use either of the models on per-group basis (in case if

"noAuthNoPriv" is configured, username serves as a replacement for community string). Reference: http://

blog.ine.com/2008/07/19/snmpv3-tutorial/


Q3. A router with an interface that is configured with ipv6 address autoconfig also has a link-local address assigned. Which message is required to obtain a global unicast address when a router is present? 

A. DHCPv6 request 

B. router-advertisement 

C. neighbor-solicitation 

D. redirect 

Answer:

Explanation: 

Autoconfiguration is performed on multicast-enabled links only and begins when a multicastenabled

interface is enabled (during system startup or manually). Nodes (both, hosts and routers) begin

the process by generating a link-local address for the interface. It is formed by appending the interface

identifier to well-known link-local prefix FE80 :: 0. The interface identifier replaces the right-most zeroes of

the link-local prefix. Before the link-local address can be assigned to the interface, the node performs the

Duplicate Address Detection mechanism to see if any other node is using the same link-local address on

the link. It does this by sending a Neighbor Solicitation message with target address as the "tentative"

address and destination address as the solicited-node multicast address corresponding to this tentative

address. If a node responds with a Neighbor Advertisement message with tentative address as the target

address, the address is a duplicate address and must not be used. Hence, manual configuration is

required. Once the node verifies that its tentative address is unique on the link, it assigns that link-local

address to the interface. At this stage, it has IP-connectivity to other neighbors on this link. The

autoconfiguration on the routers stop at this stage, further tasks are performed only by the hosts. The

routers will need manual configuration (or stateful configuration) to receive site-local or global addresses.

The next phase involves obtaining Router Advertisements from routers if any routers are present on the

link. If no routers are present, a stateful configuration is required. If routers are present, the Router

Advertisements notify what sort of configurations the hosts need to do and the hosts receive a global

unicast IPv6 address. Reference: https://sites.google.com/site/amitsciscozone/home/important-tips/ipv6/

ipv6-stateless- autoconfiguration


Q4. 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


Q5. Which three benefits does the Cisco Easy Virtual Network provide to an enterprise network? (Choose three.) 

A. simplified Layer 3 network virtualization 

B. improved shared services support 

C. enhanced management, troubleshooting, and usability 

D. reduced configuration and deployment time for dot1q trunking 

E. increased network performance and throughput 

F. decreased BGP neighbor configurations 

Answer: A,B,C 

Explanation: 


Leading ccnp route 300-101 syllabus pdf:

Q6. A network engineer is notified that several employees are experiencing network performance related issues, and bandwidth-intensive applications are identified as the root cause. In order to identify which specific type of traffic is causing this slowness, information such as the source/destination IP and Layer 4 port numbers is required. Which feature should the engineer use to gather the required information? 

A. SNMP 

B. Cisco IOS EEM 

C. NetFlow 

D. Syslog 

E. WCCP 

Answer:

Explanation: 

NetFlow Flows Key Fields

A network flow is identified as a unidirectional stream of packets between a given source and destination--

both are defined by a network-layer IP address and

transport-layer source and destination port numbers. Specifically, a flow is identified as the combination of

the following key fields:

Source IP address

Destination IP address

Source Layer 4 port number

Destination Layer 4 port number

Layer 3 protocol type

Type of service (ToS)

Input logical interface Reference: http://www.cisco.com/en/US/docs/ios-xml/ios/netflow/configuration/12-4t/

cfg-nflow- data-expt.html


Q7. Which prefix is matched by the command ip prefix-list name permit 10.8.0.0/16 ge 24 le 24? 

A. 10.9.1.0/24 

B. 10.8.0.0/24 

C. 10.8.0.0/16 

D. 10.8.0.0/23 

Answer:

Explanation: 

With prefix lists, the ge 24 term means greater than or equal to a /24 and the le 24 means less than or

equal to /24, so only a /24 is both greater than or equal to 24 and less than or equal to 24. This translate to any prefix in the 10.8.x.0/24 network, where X is any value in the 0-255 range.

Only the choice of 10.8.0.0.24 matches this.


Q8. You have been asked to evaluate how EIGRP is functioning in a customer network. 

What is the advertised distance for the 192.168.46.0 network on R1? 

A. 333056 

B. 1938688 

C. 1810944 

D. 307456 

Answer:

Explanation: 


Q9. 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 2021 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


Q10. 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:

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