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2021 Apr 300-101 test engine

Q51. What does the following access list, which is applied on the external interface FastEthernet 1/0 of the perimeter router, accomplish? 

router(config)#access-list 101 deny ip 10.0.0.0 0.255.255.255 any log 

router (config)#access-list 101 deny ip 192.168.0.0 0.0.255.255 any log 

router (config)#access-list 101 deny ip 172.16.0.0 0.15.255.255 any log 

router (config)#access-list 101 permit ip any any 

router (config)#interface fastEthernet 1/0 

router (config-if)#ip access-group 101 in 

A. It prevents incoming traffic from IP address ranges 10.0.0.0-10.0.0.255, 172.16.0.0-172.31.255.255, 192.168.0.0-192.168.255.255 and logs any intrusion attempts. 

B. It prevents the internal network from being used in spoofed denial of service attacks and logs any exit to the Internet. 

C. It filters incoming traffic from private addresses in order to prevent spoofing and logs any intrusion attempts. 

D. It prevents private internal addresses to be accessed directly from outside. 

Answer: C 

Explanation: 

The private IP address ranges defined in RFC 1918 are as follows:

10.0.0.0 - 10.255.255.255

172.16.0.0 - 172.31.255.255

192.168.0.0 - 192.168.255.255 

These IP addresses should never be allowed from external networks into a

corporate network as they would only be able to reach the network from the outside via routing problems or

if the IP addresses were spoofed. This ACL is used to prevent all packets with a spoofed reserved private

source IP address to enter the network. The log keyword also enables logging of this intrusion attempt.

Q52. 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: B 

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.

Q53. CORRECT TEXT 

You are a network engineer with ROUTE.com, a small IT company. They have recently merged two organizations and now need to merge their networks as shown in the topology exhibit. One network is using OSPF as its IGP and the other is using EIGRP as its IGP. R4 has been added to the existing OSPF network to provide the interconnect between the OSPF and EIGRP networks. Two links have been added that will provide redundancy. 

The network requirements state that you must be able to ping and telnet from loopback 101 on R1 to the OPSF domain test address of 172.16.1.100. All traffic must use the shortest path that provides the greatest bandwidth. The redundant paths from the OSPF network to the EIGRP network must be available in case of a link failure. No static or default routing is allowed in either network. 

A previous network engineer has started the merger implementation and has successfully assigned and verified all IP addressing and basic IGP routing. You have been tasked with completing the implementation and ensuring that the network requirements are met. You may not remove or change any of the configuration commands currently on any of the routers. You may add new commands or change default values. 

Answer: First we need to find out 5 parameters (Bandwidth, Delay, Reliability, Load, MTU) of the s0/0/0 interface (the interface of R2 connected to R4) for redistribution: 

R2#show interface s0/0/0 

Write down these 5 parameters, notice that we have to divide the Delay by 10 because the metric unit is in tens of microsecond. For example, we get Bandwidth=1544 Kbit, Delay=20000 us, Reliability=255, Load=1, MTU=1500 bytes then we would redistribute as follows: 

R2#config terminal 

R2(config)# router ospf 1 

R2(config-router)# redistribute eigrp 100 metric-type 1 subnets 

R2(config-router)#exit 

R2(config-router)#router eigrp 100 

R2(config-router)#redistribute ospf 1 metric 1544 2000 255 1 1500 

Note: In fact, these parameters are just used for reference and we can use other parameters with 

no problem. 

If the delay is 20000us then we need to divide it by 10, that is 20000 / 10 = 2000) 

For R3 we use the show interface fa0/0 to get 5 parameters too 

R3#show interface fa0/0 

For example we get Bandwidth=10000 Kbit, Delay=1000 us, Reliability=255, Load=1, MTU=1500 bytes 

R3#config terminal 

R3(config)#router ospf 1 

R3(config-router)#redistribute eigrp 100 metric-type 1 subnets 

R3(config)#exit 

R3(config-router)#router eigrp 100 

R3(config-router)#redistribute ospf 1 metric 10000 100 255 1 1500 

Finally you should try to “show ip route” to see the 172.16.100.1 network (the network behind R4) 

in the routing table of R1 and make a ping from R1 to this network. 

Note: If the link between R2 and R3 is FastEthernet link, we must put the command below under 

EIGRP process to make traffic from R1 to go through R3 (R1 -> R2 -> R3 -> R4), which is better 

than R1 -> R2 -> R4. 

R2(config-router)# distance eigrp 90 105 

This command sets the Administrative Distance of all EIGRP internal routes to 90 and all EIGRP external routes to 105, which is smaller than the Administrative Distance of OSPF (110) -> the link between R2 & R3 will be preferred to the serial link between R2 & R4. Note: The actual OPSF and EIGRP process numbers may change in the actual exam so be sure to use the actual correct values, but the overall solution is the same. 

Q54. 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: 

Q55. Refer to the following command: router(config)# ip http secure-port 4433 

Which statement is true? 

A. The router will listen on port 4433 for HTTPS traffic. 

B. The router will listen on port 4433 for HTTP traffic. 

C. The router will never accept any HTTP and HTTPS traffic. 

D. The router will listen to HTTP and HTTP traffic on port 4433. 

Answer: A 

Explanation: 

To set the secure HTTP (HTTPS) server port number for listening, use the ip http secure-port

command in global configuration mode. To return the HTTPS server port number to the default, use the no

form of this command. ip http secure-port port-number no ip http secure-port Syntax Description port-

Integer in the range of 0 to 65535 is accepted, but the port number must be number higher than 1024

unless the default is used. The default is 443. Reference: http://www.cisco.com/en/US/docs/ios-xml/ios/

https/command/nm-https-cr-cl- sh.html#wp3612805529

Rebirth 300-101 free exam:

Q56. For troubleshooting purposes, which method can you use in combination with the “debug ip packet” command to limit the amount of output data? 

A. You can disable the IP route cache globally. 

B. You can use the KRON scheduler. 

C. You can use an extended access list. 

D. You can use an IOS parser. 

E. You can use the RITE traffic exporter. 

Answer: C 

Explanation: 

The debug ip packet command generates a substantial amount of output and uses a substantial amount of

system resources. This command should be used with caution in production networks. Always use with the access-list command to apply an extended ACL to the debug output. Reference: http://www.cisco.com/c/en/us/support/docs/security/dynamic-multipoint-vpn-dmvpn/111976-dmvpn-troubleshoot-00.html

Q57. 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: 

Q58. Which Cisco VPN technology uses AAA to implement group policies and authorization and is also used for the XAUTH authentication method? 

A. DMVPN 

B. Cisco Easy VPN 

C. GETVPN 

D. GREVPN 

Answer: B 

Explanation: 

Q59. 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: A 

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

Q60. The enterprise network WAN link has been receiving several denial of service attacks from both IPv4 and IPv6 sources. Which three elements can you use to identify an IPv6 packet via its header, in order to filter future attacks? (Choose three.) 

A. Traffic Class 

B. Source address 

C. Flow Label 

D. Hop Limit 

E. Destination Address 

F. Fragment Offset 

Answer: A,C,D 

Explanation: