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2021 Apr 200-125 exam answers
Q11. - (Topic 8)
A router has learned three possible routes that could be used to reach a destination network One route is from EIGRP and has a composite metric of 07104371. Another route is from OSPF with a metric of 782 The last is from RIPv2 and has a metric of 4 Which route or routes will the router install in the routing table?
A. the EIGRP route
B. the OSPF route
C. the RIPv2 route
D. all three routes
E. the OSPF and RIPv2 routes
Answer: A
Q12. CORRECT TEXT - (Topic 7)
A network associate is adding security to the configuration of the Corp1 router. The user on host C should be able to use a web browser to access financial information from the Finance Web Server. No other hosts from the LAN nor the Core should be able to use a web browser to access this server. Since there are multiple resources for the corporation at this location including other resources on the Finance Web Server, all other traffic should be allowed.
The task is to create and apply an access-list with no more than three statements that will allow ONLY host C web access to the Finance Web Server. No other hosts will have web access to the Finance Web Server. All other traffic is permitted.
Access to the router CLI can be gained by clicking on the appropriate host.
All passwords have been temporarily set to "cisco".
The Core connection uses an IP address of 198.18.247.65
The computers in the Hosts LAN have been assigned addresses of 192.168.240.1 - 192.168.240.254
✑ host A 192.168.240.1
✑ host B 192.168.240.2
✑ host C 192.168.240.3
Answer:
Corp1#conf t
Corp1(config)# access-list 128 permit tcp host 192.168.240.1 host 172.22.141.26 eq www Corp1(config)# access-list 128 deny tcp any host 172.22.141.26 eq www
Corp1(config)# access-list 128 permit ip any any Corp1(config)#int fa0/1
Corp1(config-if)#ip access-group 128 out Corp1(config-if)#end
Corp1#copy run startup-config
Q13. CORRECT TEXT - (Topic 7)
Central Florida Widgets recently installed a new router in their office. Complete the network installation by performing the initial router configurations and configuring R1PV2 routing using the router command line interface (CLI) on the RC.
Configure the router per the following requirements: Name of the router is R2
Enable. secret password is cisco
The password to access user EXEC mode using the console is cisco2 The password to allow telnet access to the router is cisco3
IPV4 addresses must be configured as follows:
Ethernet network 209.165.201.0/27 - router has fourth assignable host address in subnet Serial network is 192.0.2.176/28 - router has last assignable host address in the subnet. Interfaces should be enabled.
Router protocol is RIPV2
Attention:
In practical examinations, please note the following, the actual information will prevail.
1. Name or the router is xxx
2. Enable. secret password is xxx
3. Password In access user EXEC mode using the console is xxx
4. The password to allow telnet access to the router is xxx
5. IP information
Answer:
Router>enable Router#config terminal Router(config)#hostname R2 R2(config)#enable secret Cisco 1 R2(config)#line console 0
R2(config-line)#password Cisco 2 R2(config-line)#exit R2(config)#line vty 0 4
R2(config-line)#password Cisco 3 R2(config-line)#login
R2(config-line)#exit R2(config)#interface faO/0
R2(config-if)#ip address 209.165.201.4 255.255.255.224 R2(config)#interface s0/0/0
R2(config-if)#ip address 192.0.2.190 255.255.255.240 R2(config-if)#no shutdown
R2(config-if)#exit R2(config)#router rip R2(config-router)#version 2
R2(config-router)#network 209.165.201.0
R2(config-router)#network 192.0.2.176
R2(config-router)#end R2#copy run start
Q14. - (Topic 8)
How does NAT overloading provide one-to-many address transalation?
A. it uses a pool of addresses.
B. it converts IPv4 addresses to unused IPv6 addresses.
C. it assigns a unique TCP/UDP port to each session.
D. it uses virtual MAC address and virtual IP addresses.
Answer: C
Q15. - (Topic 5)
Which three features are added in SNMPv3 over SNMPv2?
A. Message Integrity
B. Compression
C. Authentication
D. Encryption
E. Error Detection
Answer: A,C,D
Explanation:
Cisco IOS software supports the following versions of SNMP:
+ SNMPv1 – The Simple Network Management Protocol: A Full Internet Standard, defined in RFC 1157. (RFC 1157 replaces the earlier versions that were published as RFC 1067 and RFC 1098.) Security is based on community strings.
+ SNMPv2c – The community-string based Administrative Framework for SNMPv2. SNMPv2c (the “c” stands for “community”) is an Experimental Internet Protocol defined in RFC 1901, RFC 1905, and RFC 1906. SNMPv2c is an update of the protocol operations and data types of SNMPv2p (SNMPv2 Classic), and uses the community-based security model of SNMPv1.
+ SNMPv3 – Version 3 of SNMP. SNMPv3 is an interoperable standards-based protocol defined in RFCs 2273 to 2275. SNMPv3 provides secure access to devices by a combination of authenticating and encrypting packets over the network. The security features provided in SNMPv3 are as follows:
– Message integrity: Ensuring that a packet has not been tampered with in transit.
– Authentication: Determining that the message is from a valid source.
– Encryption: Scrambling the contents of a packet prevent it from being learned by an unauthorized source.
Update 200-125 exam topics:
Q16. - (Topic 3)
What OSPF command, when configured, will include all interfaces into area 0?
A. network 0.0.0.0 255.255.255.255 area 0
B. network 0.0.0.0 0.0.0.0 area 0
C. network 255.255.255.255 0.0.0.0 area 0
D. network all-interfaces area 0
Answer: A
Explanation:
Example 3-1 displays OSPF with a process ID of 1 and places all interfaces configured with an IP address in area 0. The network command network 0.0.0.0 255.255.255.255 area 0 dictates that you do not care (255.255.255.255) what the IP address is, but if an IP address is enabled on any interface, place it in area 0.
Example 3-1 Configuring OSPF in a Single Area
router ospf 1
network 0.0.0.0 255.255.255.255 area 0
Reference: http://www.ciscopress.com/articles/article.asp?p=26919&seqNum=3
Q17. - (Topic 8)
Which feature can you use to monitor traffic on a switch by replicating it to another port or ports on the same switch?
A. copy run start
B. traceroute
C. the ICMP Echo IP SLA
D. SPAN
Answer: D
Explanation: A source port, also called a monitored port, is a switched or routed port that you monitor for network traffic analysis. In a single local SPAN session or RSPAN source session, you can monitor source port traffic, such as received (Rx), transmitted (Tx), or bidirectional (both). The switch supports any number of source ports (up to the maximum
number of available ports on the switch) and any number of source VLANs. A source port has these characteristics:
✑ It can be any port type, such as EtherChannel, Fast Ethernet, Gigabit Ethernet,
and so forth.
✑ It can be monitored in multiple SPAN sessions.
✑ It cannot be a destination port.
✑ Each source port can be configured with a direction (ingress, egress, or both) to monitor. For EtherChannel sources, the monitored direction applies to all physical ports in the group.
✑ Source ports can be in the same or different VLANs.
✑ For VLAN SPAN sources, all active ports in the source VLAN are included as source ports.
Q18. CORRECT TEXT - (Topic 7)
The following have already been configured on the router:
✑ The basic router configuration
✑ The appropriate interfaces have been configured for NAT inside and NAT outside.
✑ The appropriate static routes have also been configured (since the company will be a stub network, no routing protocol will be required)
✑ All passwords have been temporarily set to “cisco”.
The task is to complete the NAT configuration using all IP addresses assigned by the ISP to provide Internet access for the hosts in the Weaver LAN. Functionality can be tested by clicking on the host provided for testing.
Configuration information:
router name – Weaver
inside global addresses – 198.18.184.105 - 198.18.184.110/29 inside local addresses - 192.168.100.17 – 192.168.100.30/28 number of inside hosts – 14
A network associate is configuring a router for the weaver company to provide internet access. The ISP has provided the company six public IP addresses of 198.18.184.105 198.18.184.110. The company has 14 hosts that need to access the internet simultaneously. The hosts in the company LAN have been assigned private space addresses in the range of 192.168.100.17 – 192.168.100.30.
Answer:
The company has 14 hosts that need to access the internet simultaneously but we just have 6 public IP addresses from 198.18.184.105 to 198.18.184.110/29. Therefore we have to use NAT overload (or PAT)
Double click on the Weaver router to open it
Router>enable Router#configure terminal
First you should change the router's name to Weaver
Router(config)#hostname Weaver
Create a NAT pool of global addresses to be allocated with their netmask. Weaver(config)#ip nat pool mypool 198.18.184.105 198.18.184.110 netmask 255.255.255.248
Create a standard access control list that permits the addresses that are to be translated.
Weaver(config)#access-list 1 permit 192.168.100.16 0.0.0.15
Establish dynamic source translation, specifying the access list that was defined in the prior step.
Weaver(config)#ip nat inside source list 1 pool mypool overload
This command translates all source addresses that pass access list 1, which means a source address from 192.168.100.17 to 192.168.100.30, into an address from the pool named mypool (the pool contains addresses from 198.18.184.105 to 198.18.184.110). Overload keyword allows to map multiple IP addresses to a single registered IP address (many-to-one) by using different ports.
The question said that appropriate interfaces have been configured for NAT inside and NAT outside statements.
This is how to configure the NAT inside and NAT outside, just for your understanding:
Weaver(config)#interface fa0/0 Weaver(config-if)#ip nat inside Weaver(config-if)#exit Weaver(config)#interface s0/0 Weaver(config-if)#ip nat outside Weaver(config-if)#end
Finally, we should save all your work with the following command:
Weaver#copy running-config startup-config
Check your configuration by going to "Host for testing" and type:
C :>ping 192.0.2.114
The ping should work well and you will be replied from 192.0.2.114
Q19. - (Topic 8)
Which two statements about late collisions are true? (Choose two.)
A. They may indicate a duplex mismatch.
B. By definition, they occur after the 512th bit of the frame has been transmitted.
C. They indicate received frames that did not pass the FCS match.
D. They are frames that exceed 1518 bytes.
E. They occur when CRC errors and interference occur on the cable.
Answer: A,B
Q20. - (Topic 8)
Refer to the exhibit.
What is the result of setting the no login command?
A. Telnet access is denied.
B. Telnet access requires a new password at the first login.
C. Telnet access requires a new password.
D. no password is required for telnet access.
Answer: D
