[Free] 2017(Oct) Dumps4cert Testinsides Cisco 200-125 Dumps with VCE and PDF Download 221-230

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CCNA Cisco Certified Network Associate CCNA (v3.0)

Question No: 221 – (Topic 5)

Refer to the exhibit.

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All of the routers in the network are configured with the ip subnet-zero command. Which network addresses should be used for Link A and Network A? (Choose two.)

A. Network A – 172.16.3.48/26 B. Network A – 172.16.3.128/25 C. Network A – 172.16.3.192/26 D. Link A – 172.16.3.0/30

E. Link A – 172.16.3.40/30

F. Link A – 172.16.3.112/30

Answer: B,D Explanation:

Only a /30 is needed for the point to point link and sine the use of the ip subnet-zero was used, 172.16.3.0/30 is valid. Also, a /25 is required for 120 hosts and again 172.16.3.128/25 is the best, valid option.

Question No: 222 – (Topic 5)

Which three statements about the features of SNMPv2 and SNMPv3 are true? (Choose three.)

  1. SNMPv3 enhanced SNMPv2 security features.

  2. SNMPv3 added the Inform protocol message to SNMP.

  3. SNMPv2 added the Inform protocol message to SNMP.

  4. SNMPv3 added the GetBulk protocol messages to SNMP.

  5. SNMPv2 added the GetBulk protocol message to SNMP.

  6. SNMPv2 added the GetNext protocol message to SNMP.

Answer: A,C,E Explanation:

SNMPv1/v2 can neither authenticate the source of a management message nor provide encryption. Without authentication, it is possible for nonauthorized users to exercise SNMP network management functions. It is also possible for nonauthorized users to eavesdrop on management information as it passes from managed systems to the management system. Because of these deficiencies, many SNMPv1/v2 implementations are limited to simply a read-only capability, reducing their utility to that of a network monitor; no network control applications can be supported. To correct the security deficiencies of SNMPv1/v2, SNMPv3 was issued as a set of Proposed Standards in January 1998. -gt; A is correct.

The two additional messages are added in SNMP2 (compared to SNMPv1)

GetBulkRequest The GetBulkRequest message enables an SNMP manager to access large chunks of data. GetBulkRequest allows an agent to respond with as much information as will fit in the response PDU. Agents that cannot provide values for all variables in a list will send partial information. -gt; E is correct.

InformRequest The InformRequest message allows NMS stations to share trap information. (Traps are issued by SNMP agents when a device change occurs.) InformRequest messages are generally used between NMS stations, not between NMS stations and

agents. -gt; C is correct.

Note: These two messages are carried over SNMPv3.

Question No: 223 – (Topic 5)

Refer to the exhibit.

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Which rule does the DHCP server use when there is an IP address conflict?

  1. The address is removed from the pool until the conflict is resolved.

  2. The address remains in the pool until the conflict is resolved.

  3. Only the IP detected by Gratuitous ARP is removed from the pool.

  4. Only the IP detected by Ping is removed from the pool.

  5. The IP will be shown, even after the conflict is resolved.

Answer: A Explanation:

An address conflict occurs when two hosts use the same IP address. During address assignment, DHCP checks for conflicts using ping and gratuitous ARP. If a conflict is detected, the address is removed from the pool. The address will not be assigned until the administrator resolves the conflict.

(Reference: http://www.cisco.com/en/US/docs/ios/12_1/iproute/configuration/guide/1cddhcp.html)

Question No: 224 – (Topic 5)

Which two statements about static NAT translations are true? (Choose two.)

  1. They allow connections to be initiated from the outside.

  2. They require no inside or outside interface markings because addresses are statically defined.

  3. They are always present in the NAT table.

  4. They can be configured with access lists, to allow two or more connections to be initiated from the outside.

Answer: A,C Explanation:

Static NAT is to map a single outside IP address to a single inside IP address. This is typically done to allow incoming connections from the outside (Internet) to the inside. Since these are static, they are always present in the NAT table even if they are not actively in use.

Question No: 225 – (Topic 5)

Which statement is correct regarding the operation of DHCP?

  1. A DHCP client uses a ping to detect address conflicts.

  2. A DHCP server uses a gratuitous ARP to detect DHCP clients.

  3. A DHCP client uses a gratuitous ARP to detect a DHCP server.

  4. If an address conflict is detected, the address is removed from the pool and an administrator must resolve the conflict.

  5. If an address conflict is detected, the address is removed from the pool for an amount of time configurable by the administrator.

  6. If an address conflict is detected, the address is removed from the pool and will not be reused until the server is rebooted.

Answer: D Explanation:

An address conflict occurs when two hosts use the same IP address. During address assignment, DHCP checks for conflicts using ping and gratuitous ARP. If a conflict is detected, the address is removed from the pool. The address will not be assigned until the administrator resolves the conflict.

(Reference: http://www.cisco.com/en/US/docs/ios/12_1/iproute/configuration/guide/1cddhcp.html)

Question No: 226 – (Topic 5)

Which option is a valid IPv6 address?

A. 2001:0000:130F::099a::12a

B. 2002:7654:A1AD:61:81AF:CCC1

C. FEC0:ABCD:WXYZ:0067::2A4

D. 2004:1:25A4:886F::1

Answer: D Explanation:

An IPv6 address is represented as eight groups of four hexadecimal digits, each group representing 16 bits (two octets). The groups are separated by colons (:). An example of an IPv6 address is 2001:0db8:85a3:0000:0000:8a2e:0370:7334. The leading 0’s in a group can be collapsed using ::, but this can only be done once in an IP address.

Question No: 227 – (Topic 5)

The network administrator needs to address seven LANs. RIP version 1 is the only routing protocol in use on the network and subnet 0 is not being used. What is the maximum number of usable IP addresses that can be supported on each LAN if the organization is using one class C address block?

  1. 8

  2. 6

  3. 30

  4. 32

  5. 14

  6. 16

Answer: C Explanation:

Since there is one class C network that means 256 total IP addresses. Since we need 7 LAN blocks and we cannot use the first one (subnet 0) we take 256/8=32 hosts. However, since we need to reserve the network and broadcast addresses for each of these subnets, only 30 total IP addresses are usable.

Question No: 228 – (Topic 5)

Which command enables IPv6 forwarding on a Cisco router?

  1. ipv6 local

  2. ipv6 host

  3. ipv6 unicast-routing

  4. ipv6 neighbor

Answer: C Explanation:

To enable IPv6 routing on the Cisco router use the following command: ipv6 unicast-routing

If this command is not recognized, your version of IOS does not support IPv6.

Question No: 229 – (Topic 5)

On which options are standard access lists based?

  1. destination address and wildcard mask

  2. destination address and subnet mask

  3. source address and subnet mask

  4. source address and wildcard mask

Answer: D

Explanation:

Standard ACL’s only examine the source IP address/mask to determine if a match is made. Extended ACL’s examine the source and destination address, as well as port information.

Question No: 230 – (Topic 5)

What SNMP message alerts the manager to a condition on the network?

  1. response

  2. get

  3. trap

  4. capture

Answer: C Explanation:

An agent can send unsolicited traps to the manager. Traps are messages alerting the SNMP manager to a condition on the network. Traps can mean improper user authentication, restarts, link status (up or down), MAC address tracking, closing of a TCP connection, loss of connection to a neighbor, or other significant events.

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2950/software/release/12- 1_9_ea1/configuration/guide/scg/swsnmp.html

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