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2021 Apr 300-101 exam answers

Q11. 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: A 

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


Q12. 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: C 

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


Q13. Which PPP authentication method sends authentication information in cleartext? 

A. MS CHAP 

B. CDPCP 

C. CHAP 

D. PAP 

Answer: D 

Explanation: 


Q14. You have been asked to evaluate how EIGRP is functioning in a customer network. 

What type of route filtering is occurring on R6 

A. Distribute-list using an ACL 

B. Distribute-list using a prefix-list 

C. Distribute-list using a route-map 

D. An ACL using a distance of 255 

Answer: A 

Explanation: 


Q15. 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: 


Renovate 300-101 actual test:

Q16. A network engineer is asked to configure a "site-to-site" IPsec VPN tunnel. One of the last things that the engineer does is to configure an access list (access-list 1 permit any) along with the command ip nat inside source list 1 int s0/0 overload. Which functions do the two commands serve in this scenario? 

A. The command access-list 1 defines interesting traffic that is allowed through the tunnel. 

B. The command ip nat inside source list 1 int s0/0 overload disables "many-to-one" access for all devices on a defined segment to share a single IP address upon exiting the external interface. 

C. The command access-list 1 permit any defines only one machine that is allowed through the tunnel. 

D. The command ip nat inside source list 1 int s0/0 overload provides "many-to-one" access for all devices on a defined segment to share a single IP address upon exiting the external interface. 

Answer: D 

Explanation: 

Configuring NAT to Allow Internal Users to Access the Internet Using Overloading NAT Router

interface ethernet 0

ip address 10.10.10.1 255.255.255.0

ip nat inside

!--- Defines Ethernet 0 with an IP address and as a NAT inside interface.

interface ethernet 1

ip address 10.10.20.1 255.255.255.0

ip nat inside

!--- Defines Ethernet 1 with an IP address and as a NAT inside interface.

interface serial 0

ip address 172.16.10.64 255.255.255.0

ip nat outside

!--- Defines serial 0 with an IP address and as a NAT outside interface.

ip nat pool ovrld 172.16.10.1 172.16.10.1 prefix 24 !

!--- Defines a NAT pool named ovrld with a range of a single IP

!--- address, 172.16.10.1.

ip nat inside source list 7 pool ovrld overload

!

!

!

!

!--- Indicates that any packets received on the inside interface that

!--- are permitted by access-list 7 has the source

address

!--- translated to an address out of the NAT pool named ovrld.

!--- Translations are overloaded, which allows multiple inside

!--- devices to be translated to the same valid IP

address.

access-list 7 permit 10.10.10.0 0.0.0.31

access-list 7 permit 10.10.20.0 0.0.0.31

!--- Access-list 7 permits packets with source addresses ranging from

!--- 10.10.10.0 through 10.10.10.31 and 10.10.20.0

through 10.10.20.31.

Note in the previous second configuration, the NAT pool "ovrld"only has a range of one address. The

keyword overload used in the ip nat inside source list 7 pool

ovrld overload command allows NAT to translate multiple inside devices to the single address in the pool.

Reference:

http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080094e77.shtml


Q17. Which common issue causes intermittent DMVPN tunnel flaps? 

A. a routing neighbor reachability issue 

B. a suboptimal routing table 

C. interface bandwidth congestion 

D. that the GRE tunnel to hub router is not encrypted 

Answer: A 

Explanation: 

DMVPN Tunnel Flaps Intermittently Problem DMVPN tunnel flaps intermittently. Solution

When DMVPN tunnels flap, check the neighborship between the routers as issues with neighborship

formation between routers may cause the DMVPN tunnel to flap. In order to resolve this problem, make

sure the neighborship between the routers is always up. Reference: http://www.cisco.com/c/en/us/support/

docs/security-vpn/ipsec-negotiation-ike- protocols/29240-dcmvpn.html#Prblm1


Q18. Refer to the exhibit. Which statement about the command output is true? 

A. The router exports flow information to 10.10.10.1 on UDP port 5127. 

B. The router receives flow information from 10.10.10.2 on UDP port 5127. 

C. The router exports flow information to 10.10.10.1 on TCP port 5127. 

D. The router receives flow information from 10.10.10.2 on TCP port 5127. 

Answer: A 

Explanation: 


Q19. What is the primary service that is provided when you implement Cisco Easy Virtual Network? 

A. It requires and enhances the use of VRF-Lite. 

B. It reduces the need for common services separation. 

C. It allows for traffic separation and improved network efficiency. 

D. It introduces multi-VRF and label-prone network segmentation. 

Answer: C 

Explanation: 


Q20. Which three items can you track when you use two time stamps with IP SLAs? (Choose three.) 

A. delay 

B. jitter 

C. packet loss 

D. load 

E. throughput 

F. path 

Answer: A,B,C