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New Cisco 200-125 Exam Dumps Collection (Question 16 - Question 24)

New Questions 16

Under which circumstance should a network administrator implement one-way NAT?

A. when the network must route UDP traffic

B. when traffic that originates outside the network must be routed to internal hosts

C. when traffic that originates inside the network must be routed to internal hosts

D. when the network has few public IP addresses and many private IP addresses require outside access

Answer: B

Explanation: NAT operation is typically transparent to both the internal and external hosts. Typically the internal host is aware of the true IP address and TCP or UDP port of the external host. Typically the NAT device may function as the default gateway for the internal host. However the external host is only aware of the public IP address for the NAT device and the particular port being used to communicate on behalf of a specific internal host.

NAT and TCP/UDP

"Pure NAT", operating on IP alone, may or may not correctly parse protocols that are totally concerned with IP information, such asICMP, depending on whether the payload is interpreted by a host on the "inside" or "outside" of translation. As soon as the protocol stack is traversed, even with such basic protocols asTCPandUDP, the protocols will break unless NAT takes action beyond the network layer.

IP packets have a checksum in each packet header, which provides error detection only for the header. IP datagrams may become fragmented and it is necessary for a NAT to reassemble these fragments to allow correct recalculation of higher-level checksums and correct tracking of which packets belong to which connection.

The major transport layer protocols, TCP and UDP, have a checksum that covers all the data they carry, as well as the TCP/UDP header, plus a "pseudo-header" that contains the source and destination IP addresses of the packet carrying the TCP/UDP header. For an originating NAT to pass TCP or UDP successfully, it must recompute the TCP/UDP header checksum based on the translated IP addresses, not the original ones, and put that checksum into the TCP/UDP header of the first packet of the fragmented set of packets. The receiving NAT must recompute the IP checksum on every packet it passes to the destination host, and also recognize and recompute the TCP/UDP header using the retranslated addresses and pseudo-header. This is not a completely solved problem. One solution is for the receiving NAT to reassemble the entire segment and then recompute a checksum calculated across all packets.

The originating host may performMaximum transmission unit(MTU)path discoveryto determine the packet size that can be transmitted without fragmentation, and then set the don't fragment(DF) bit in the appropriate packet header field. Of course, this is only a one- way solution, because the responding host can send packets of any size, which may be fragmented before reaching the NAT.


New Questions 17

Which command can you enter to verify that a 128-bit address is live and responding?

A. traceroute

B. telnet

C. ping

D. ping ipv6

Answer: D


New Questions 18

What are two drawbacks of implementing a link-state routing protocol? (Choose two.)

A. the sequencing and acknowledgment of link-state packets

B. the high volume of link-state advertisements in a converged network

C. the requirement for a hierarchical IP addressing scheme for optimal functionality

D. the high demand on router resources to run the link-state routing algorithm

E. the large size of the topology table listing all advertised routes in the converged network

Answer: C,D


New Questions 19

Which three technical services support cloud computing? (Choose three.)

A. Layer 3 network routing

B. redundant connections

C. extended SAN services

D. IP localization

E. VPN connectivity

Answer: B,C,D


New Questions 20

Which effect of the passive-Interface command on R1 is true?

A. It removes the 172.16.0.0 network from all updates on all interfaces on R1.

B. It prevents interface Fa0/0 from sending updates.

C. Interface Fa0/0 operates in RIPv1 mode.

D. It removes the 172.17.0.0 network from all updates on all interfaces on R1.

Answer: B


New Questions 21

Which command can you enter to route all traffic that is destined for 192.168.0.0/20 to a specific interface?

A. router(config)#ip route 192.168.0.0 255.255.240.0 GigabitEthernet0/1

B. router(config)#ip route 0.0.0.0 255.255.255.0 GigabitEthernet0/1

C. router(config)#ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/1

D. router(config)#ip route 192.168.0.0 255.255.255.0 GigabitEthernet0/1

Answer: A


New Questions 22

Which protocol authenticates connected devices before allowing them to access the LAN?

A. 802.1d

B. 802.11

C. 802.1w

D. 802.1x

Answer: D

Explanation:

802.1X authentication involves three parties: a supplicant, an authenticator, and an authentication server. Thesupplicantis a client device (such as a laptop) that wishes to attach to the LAN/WLAN. The term 'supplicant' is also used interchangeably to refer to the software running on the client that provides credentials to the authenticator. The authenticatoris a network device, such as an Ethernet switch or wireless access point; and theauthentication serveris typically a host running software supporting the RADIUS and EAP protocols.

The authenticator acts like a security guard to a protected network. The supplicant (i.e., client device) is not allowed access through the authenticator to the protected side of the network until the supplicantu2019s identity has been validated and authorized. An analogy to this is providing a valid visa at the airport's arrival immigration before being allowed to enter the country. With 802.1X port-based authentication, the supplicant provides credentials, such as user name/password or digital certificate, to the authenticator, and the authenticator forwards the credentials to the authentication server for verification. If the authentication server determines the credentials are valid, the supplicant (client device) is allowed to access resources located on the protected side of the network.


New Questions 23

Which configuration can you apply to enable encapsulation on a subinterface?

A. interface FastEthernet 0/0 encapsulation dot1Q 30

ip address 10.1.1.30 255.255.255.0

B. interface FastEthernet 0/0.30

ip address 10.1.1.30 255.255.255.0

C. interface FastEthernet 0/0.30 description subinterface vlan 30

D. interface FastEthernet 0/0.30 encapsulation dot1Q 30

ip address 10.1.1.30 255.255.255.0

Answer: D


New Questions 24

What is a difference between TACACS+ and RADIUS in AAA?

A. Only TACACS+ allows for separate authentication.

B. Only RADIUS encrypts the entire access-request packet.

C. Only RADIUS uses TCP.

D. Only TACACS+ couples authentication and authorization.

Answer: A

Explanation: Authentication and Authorization

RADIUS combines authentication and authorization. The access-accept packets sent by the RADIUS server to the client contain authorization information. This makes it difficult to decouple authentication and authorization.

TACACS+ uses the AAA architecture, which separates AAA. This allows separate authentication solutions that can still use TACACS+ for authorization and accounting. For example, with TACACS+, it is possible to use Kerberos authentication and TACACS+ authorization and accounting. After a NAS authenticates on a Kerberos server, it requests authorization information from a TACACS+ server without having to re-authenticate. The NAS informs the TACACS+ server that it has successfully authenticated on a Kerberos server, and the server then provides authorization information.

During a session, if additional authorization checking is needed, the access server checks with a TACACS+ server to determine if the user is granted permission to use a particular command. This provides greater control over the commands that can be executed on the access server while decoupling from the authentication mechanism.


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