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New Cisco 200-125 Exam Dumps Collection (Question 5 - Question 14)
Q5. A network administrator is configuring ACLs on a Cisco router, to allow traffic from hosts on networks 192.168.146.0, 192.168.147.0, 192.168.148.0, and 192.168.149.0 only. Which two ACL statements, when combined, would you use to accomplish this task? (Choose two.)
A. access-list 10 permit ip 192.168.146.0 0.0.1.255
B. access-list 10 permit ip 192.168.147.0 0.0.255.255
C. access-list 10 permit ip 192.168.148.0 0.0.1.255
D. access-list 10 permit ip 192.168.149.0 0.0.255.255
E. access-list 10 permit ip 192.168.146.0 0.0.0.255
F. access-list 10 permit ip 192.168.146.0 255.255.255.0
Answer: A,C
Explanation:
u201caccess-list 10 permit ip 192.168.146.0 0.0.1.255u201d would allow only the 192.168.146.0 and
192.168.147.0 networks, and u201caccess-list 10 permit ip 192.168.148.0 0.0.1.255u201d would allow only the 192.168.148.0 and 192.168.149.0 networks.
Q6. What are three values that must be the same within a sequence of packets for Netflow to consider them a network flow? (Choose three.)
A. source IP address
B. source MAC address
C. egress interface
D. ingress interface
E. destination IP address
F. IP next-hop
Answer: A,D,E
Explanation:
Each packet that is forwarded within a router or switch is examined for a set of IP packet attributes. These attributes are the IP packet identity or fingerprint of the packet and determine if the packet is unique or similar to other packets.
Traditionally, an IP Flow is based on a set of 5 and up to 7 IP packet attributes. IP Packet attributes used by NetFlow:
u2022 IP source address
u2022 IP destination address
u2022 Source port
u2022 Destination port
u2022 Layer 3 protocol type
u2022 Class of Service
u2022 Router or switch interface
All packets with the same source/destination IP address, source/destination ports, protocol interface and class of service are grouped into a flow and then packets and bytes are tallied. This methodology of fingerprinting or determining a flow is scalable because a large
amount of network information is condensed into a database of NetFlow information called the NetFlow cache.
Reference: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/ios-netflow/prod_white_paper0900aecd80406232.html
Q7. Refer to exhibit.
A network administrator cannot establish a Telnet session with the indicated router. What is the cause of this failure?
A. A Level 5 password is not set.
B. An ACL is blocking Telnet access.
C. The vty password is missing.
D. The console password is missing.
Answer: C
Explanation:
The login keyword has been set, but not password. This will result in the u201cpassword
required, but none setu201d message to users trying to telnet to this router.
Q8. Which statement describes the process of dynamically assigning IP addresses by the DHCP server?
A. Addresses are allocated after a negotiation between the server and the host to determine the length of the agreement.
B. Addresses are permanently assigned so that the hosts uses the same address at all times.
C. Addresses are assigned for a fixed period of time, at the end of the period, a new request for an address must be made.
D. Addresses are leased to hosts, which periodically contact the DHCP server to renew the lease.
Answer: D
Explanation:
The DHCP lifecycle consists of the following:
u2711 Allocation:A client begins with no active lease, and hence, no DHCP-assigned address. It acquires a lease through a process ofallocation.
u2711 Reallocation:If a client already has an address from an existing lease, then when it reboots or starts up after being shut down, it will contact the DHCP server that granted it the lease to confirm the lease and acquire operating parameters. This is sometimes calledreallocation; it is similar to the full allocation process but shorter.
u2711 Normal Operation:Once a lease is active, the client functions normally, using its assigned IP address and other parameters during the u201cmain partu201d of the lease. The client is said to beboundto the lease and the address.
u2711 Renewal:After a certain portion of the lease time has expired, the client will attempt to contact the server that initially granted the lease, torenewthe lease so it can
keep using its IP address.
u2711 Rebinding.If renewal with the original leasing server fails (because, for example, the server has been taken offline), then the client will try torebindto any active DHCP server, trying to extend its current lease with any server that will allow it to do so.
u2711 Release:The client may decide at any time that it no longer wishes to use the IP address it was assigned, and may terminate the lease,releasingthe IP address.
Q9. How does using the service password-encryption command on a router provide additional security?
A. by encrypting all passwords passing through the router
B. by encrypting passwords in the plain text configuration file
C. by requiring entry of encrypted passwords for access to the device
D. by configuring an MD5 encrypted key to be used by routing protocols to validate routing exchanges
E. by automatically suggesting encrypted passwords for use in configuring the router
Answer: B
Explanation:
By using this command, all the (current and future) passwords are encrypted. This command is primarily useful for keeping unauthorized individuals from viewing your password in your configuration file
Q10. What are three factors a network administrator must consider before implementing Netflow in the network? (Choose three.)
A. CPU utilization
B. where Netflow data will be sent
C. number of devices exporting Netflow data
D. port availability
E. SNMP version
F. WAN encapsulation
Answer: A,B,C
Explanation:
NetFlow has a reputation for increasing CPU utilization on your network devices. Cisco's performance testing seems to indicate that newer hardware can accommodate this load pretty well, but you will still want to check it out before you turn on the feature. Some symptoms of high CPU utilization are very large jitter and increased delay. Services running on the device may also be affected.
Another thing to keep in mind is the amount of data you're going to be sending across the network. Depending on how much traffic you have and how you configure it, the traffic can be substantial. For example, you may not want to send NetFlow data from a datacenter switch to a NetFlow collector on the other side of a small WAN circuit. Also bear in mind that the flows from aggregating large numbers of devices can add up.
Reference: http://searchenterprisewan.techtarget.com/tip/How-the-NetFlow-protocol- monitors-your-WAN
Q11. Scenario:
Refer to the topology. Your company has decided to connect the main office with three
other remote branch offices using point-to-point serial links.
You are required to troubleshoot and resolve OSPF neighbor adjacency issues between the main office and the routers located in the remote branch offices.
R1 does not form an OSPF neighbor adjacency with R2. Which option would fix the issue?
A. R1 ethernet0/1 is shutdown. Configure no shutdown command.
B. R1 ethernet0/1 configured with a non-default OSPF hello interval of 25; configure no ip ospf hello-interval 25.
C. R2 ethernet0/1 and R3 ethernet0/0 are configured with a non-default OSPF hello
interval of 25; configure no ip ospf hello-interval 25.
D. Enable OSPF for R1 ethernet0/1; configure ip ospf 1 area 0 command under ethernet0/1.
Answer: B
Explanation:
Looking at the configuration of R1, we see that R1 is configured with a hello interval of 25 on interface Ethernet 0/1 while R2 is left with the default of 10 (not configured).
Q12. What are the three things that the Netflow uses to consider the traffic to be in a same flow? (Choose three)
A. IP address
B. Interface name
C. Port numbers
D. L3 protocol type
E. MAC address
Answer: A,C,D
Explanation:
What is an IP Flow?
Each packet that is forwarded within a router or switch is examined for a set of IP packet attributes. These attributes are the IP packet identity or fingerprint of the packet and determine if the packet is unique or similar to other packets.
Traditionally, an IP Flow is based on a set of 5 and up to 7 IP packet attributes. IP Packet attributes used by NetFlow:
+ IP source address
+ IP destination address
+ Source port
+ Destination port
+ Layer 3 protocol type
+ Class of Service
+ Router or switch interface
Q13. Which set of commands is recommended to prevent the use of a hub in the access layer?
A. switch(config-if)#switchport mode trunk switch(config-if)#switchport port-security maximum 1
B. switch(config-if)#switchport mode trunk
switch(config-if)#switchport port-security mac-address 1
C. switch(config-if)#switchport mode access switch(config-if)#switchport port-security maximum 1
D. switch(config-if)#switchport mode access switch(config-if)#switchport port-security mac-address 1
Answer: C
Explanation:
This question is to examine the layer 2 security configuration.
In order to satisfy the requirements of this question, you should perform the following
configurations in the interface mode:
First, configure the interface mode as the access mode
Second, enable the port security and set the maximum number of connections to 1.
Q14. On which options are standard access lists based?
A. destination address and wildcard mask
B. destination address and subnet mask
C. source address and subnet mask
D. source address and wildcard mask
Answer: D
Explanation:
Standard ACLu2021s only examine the source IP address/mask to determine if a match is made. Extended ACLu2021s examine the source and destination address, as well as port information.
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