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Q71. Which PPP authentication method sends authentication information in clear text? 

A. MS CHAP 

B. CDPCP 

C. CHAP 

D. PAP 

Answer:

Explanation: 

PAP authentication involves a two-way handshake where the username and password are

sent across the link in clear text; hence, PAP authentication does not provide any protection against

playback and line sniffing. CHAP authentication, on the other hand, periodically verifies the identity of the

remote node using a three-way handshake. After the PPP link is established, the host sends a "challenge"

message to the remote node. The remote node responds with a value calculated using a one-way hash

function. The host checks the response against its own calculation of the expected hash value. If the

values match, the authentication is acknowledged; otherwise, the connection is terminated. Reference:

http://www.cisco.com/c/en/us/support/docs/wan/point-to-point-protocol-ppp/10241- ppp-callinhostname.

html


Q72. Refer to the exhibit. 

A network administrator checks this adjacency table on a router. What is a possible cause for the incomplete marking? 

A. incomplete ARP information 

B. incorrect ACL 

C. dynamic routing protocol failure 

D. serial link congestion 

Answer:

Explanation: 

To display information about the Cisco Express Forwarding adjacency table or the hardware Layer 3-

switching adjacency table, use the show adjacency command.

Reasons for Incomplete Adjacencies

There are two known reasons for an incomplete adjacency:

The router cannot use ARP successfully for the next-hop interface.

After a clear ip arp or a clear adjacency command, the router marks the adjacency as incomplete. Then it

fails to clear the entry.

In an MPLS environment, IP CEF should be enabeled for Label Switching. Interface level command ip

route-cache cef No ARP Entry When CEF cannot locate a valid adjacency for a destination prefix, it punts

the packets to the CPU for ARP resolution and, in turn, for completion of the adjacency.

Reference: http://www.cisco.com/c/en/us/support/docs/ip/express-forwarding-cef/17812-cefincomp.

html#t4


Q73. 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:

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


Most up-to-date cisco ccnp route 300-101 hands-on labs exam prep download:

Q74. Refer to the following access list. 

access-list 100 permit ip any any log 

After applying the access list on a Cisco router, the network engineer notices that the router CPU utilization has risen to 99 percent. What is the reason for this? 

A. A packet that matches access-list with the "log" keyword is Cisco Express Forwarding switched. 

B. A packet that matches access-list with the "log" keyword is fast switched. 

C. A packet that matches access-list with the "log" keyword is process switched. 

D. A large amount of IP traffic is being permitted on the router. 

Answer:

Explanation: 

Logging-enabled access control lists (ACLs) provide insight into traffic as it traverses the

network or is dropped by network devices. Unfortunately, ACL logging can be CPU intensive and can

negatively affect other functions of the network device. There are two primary factors that contribute to the

CPU load increase from ACL logging: process switching of packets that match log-enabled access control

entries (ACEs) and the generation and transmission of log messages. Reference: http://www.cisco.com/

web/about/security/intelligence/acl-logging.html#4


Q75. A company's corporate policy has been updated to require that stateless, 1-to-1, and IPv6 to IPv6 translations at the Internet edge are performed. What is the best solution to ensure compliance with this new policy? 

A. NAT64 

B. NAT44 

C. NATv6 

D. NPTv4 

E. NPTv6 

Answer:

Explanation: 

NPTv6 provides a mechanism to translate the private internal organization prefixes to public globally

reachable addresses. The translation mechanism is stateless and provides a 1:1 relationship between the internal addresses and external addresses. The use cases for NPTv6 outlined in the RFC include peering with partner networks, multi homing, and redundancy and load sharing.

Reference:

http://www.cisco.com/c/dam/en/us/td/docs/solutions/SBA/August2012/Cisco_SBA_BN_IPv6AddressingGuide-Aug2012.pdf


Q76. Which two actions must you perform to enable and use window scaling on a router? (Choose two.) 

A. Execute the command ip tcp window-size 65536. 

B. Set window scaling to be used on the remote host. 

C. Execute the command ip tcp queuemax. 

D. Set TCP options to "enabled" on the remote host. 

E. Execute the command ip tcp adjust-mss. 

Answer: A,B 

Explanation: 

The TCP Window Scaling feature adds support for the Window Scaling option in RFC 1323,

TCP Extensions for High Performance . A larger window size is recommended to improve TCP performance in network paths with large bandwidth-delay product characteristics that are called Long Fat

Networks (LFNs). 

The TCP Window Scaling enhancement provides that support. The window scaling extension in Cisco IOS software expands the definition of the TCP window to 32 bits and then uses a scale factor to carry this 32-bit value in the 16-bit window field of the TCP header. 

The window size can increase to a scale factor of 14. Typical applications use a scale factor of 3 when deployed in LFNs. 

The TCP Window Scaling feature complies with RFC 1323. The larger scalable window size will allow TCP to perform better over LFNs. 

Use the ip tcp window-size command in global configuration mode to configure the TCP window size. In order for this to work, the remote host must also support this feature and its window size must be increased. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp/

configuration/12-4t/iap-12- 4t-book/iap-tcp.html#GUID-BD998AC6-F128-47DD-B5F7-B226546D4B08


Q77. Which address is used by the Unicast Reverse Path Forwarding protocol to validate a packet against the routing table? 

A. source address 

B. destination address 

C. router interface 

D. default gateway 

Answer:

Explanation: 

The Unicast RPF feature helps to mitigate problems that are caused by the introduction of

malformed or forged (spoofed) IP source addresses into a network by discarding IP packets that lack a

verifiable IP source address. For example, a number of common types of denial-of-service (DoS) attacks,

including Smurf and Tribal Flood Network (TFN), can take advantage of forged or rapidly changing source

IP addresses to allow attackers to thwart efforts to locate or filter the attacks. For Internet service providers

(ISPs) that provide public access, Unicast RPF deflects such attacks by forwarding only packets that have

source addresses that are valid and consistent with the IP routing table. This action protects the network of

the ISP, its customer, and the rest of the Internet. Reference: http://www.cisco.com/en/US/docs/ios/12_2/

security/configuration/guide/scfrpf.html


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