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Learning The New PassLeader Cisco 200-120 Exam Questions For 100 Percent Passing (81-90)

QUESTION 81
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:
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, releasing the IP address.

QUESTION 82
What are two benefits of using NAT? (Choose two.)

A.    NAT facilitates end-to-end communication when IPsec is enabled.
B.    NAT eliminates the need to re-address all hosts that require external access.
C.    NAT conserves addresses through host MAC-level multiplexing.
D.    Dynamic NAT facilitates connections from the outside of the network.
E.    NAT accelerates the routing process because no modifications are made on the packets.
F.    NAT protects network security because private networks are not advertised.

Answer: BF
Explanation:
By not revealing the internal Ip addresses, NAT adds some security to the inside network -> F is correct.
NAT has to modify the source IP addresses in the packets -> E is not correct.
Connection from the outside of the network through a “NAT” network is more difficult than a more network because IP addresses of inside hosts are hidden -> C is not correct.
In order for IPsec to work with NAT we need to allow additional protocols, including Internet Key Exchange (IKE), Encapsulating Security Payload (ESP) and Authentication Header (AH) -> more complex -> A is not correct.
By allocating specific public IP addresses to inside hosts, NAT eliminates the need to re-address the inside hosts -> B is correct.
NAT does conserve addresses but not through host MAC-level multiplexing. It conserves addresses by allowing many private IP addresses to use the same public IP address to go to the Internet -> C is not correct.

QUESTION 83
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 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 84
A network engineer wants to allow a temporary entry for a remote user with a specific username and password so that the user can access the entire network over the Internet. Which ACL can be used?

A.    standard
B.    extended
C.    dynamic
D.    reflexive

Answer: C
Explanation:
We can use a dynamic access list to authenticate a remote user with a specific username and password. The authentication process is done by the router or a central access server such as a TACACS+ or RADIUS server. The configuration of dynamic ACL can be read here:
http://www.cisco.com/en/US/tech/tk583/tk822/technologies_tech_note09186a0080094524.shtml

QUESTION 85
How does a DHCP server dynamically assign IP addresses to hosts?

A.    Addresses are permanently assigned so that the host uses the same address at all times.
B.    Addresses are assigned for a fixed period of time. At the end of the period, a new request for an address must be made, and another address is then assigned.
C.    Addresses are leased to hosts. A host will usually keep the same address by periodically contacting the DHCP server to renew the lease.
D.    Addresses are allocated after a negotiation between the server and the host to determine the length of the agreement.

Answer: C
Explanation:
DHCP works in a client/server mode and operates like any other client/server relationship. When a PC connects to a DHCP server, the server assigns or leases an IP address to that PC. The PC connects to the network with that leased IP address until the lease expires. The host must contact the DHCP server periodically to extend the lease. This lease mechanism ensures that hosts that move or power off do not hold onto addresses that they do not need. The DHCP server returns these addresses to the address pool and reallocates them as necessary.


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QUESTION 86
Which two tasks does the Dynamic Host Configuration Protocol perform? (Choose two.)

A.    Set the IP gateway to be used by the network.
B.    Perform host discovery used DHCPDISCOVER message.
C.    Configure IP address parameters from DHCP server to a host.
D.    Provide an easy management of layer 3 devices.
E.    Monitor IP performance using the DHCP server.
F.    Assign and renew IP address from the default pool.

Answer: CF
Explanation:
The Dynamic Host Configuration Protocol (DHCP) is a network protocol used to configure devices that are connected to a network (known as hosts) so they can communicate on that network using the Internet Protocol (IP). It involves clients and a server operating in a client-server model. DHCP servers assigns IP addresses from a pool of addresses and also assigns other parameters such as DNS and default gateways to hosts.

QUESTION 87
When a DHCP server is configured, which two IP addresses should never be assignable to hosts? (Choose two.)

A.    network or subnetwork IP address
B.    broadcast address on the network
C.    IP address leased to the LAN
D.    IP address used by the interfaces
E.    manually assigned address to the clients
F.    designated IP address to the DHCP server

Answer: AB
Explanation:
Network or subnetwork IP address (for example 11.0.0.0/8 or 13.1.0.0/16) and broadcast address (for example 23.2.1.255/24) should never be assignable to hosts. When try to assign these addresses to hosts, you will receive an error message saying that they can’t be assignable.

QUESTION 88
Which two statements about static NAT translations are true? (Choose two.)

A.    They allow connections to be initiated from the outside.
B.    They require no inside or outside interface markings because addresses are statically defined.
C.    They are always present in the NAT table.
D.    They can be configured with access lists, to allow two or more connections to be initiated from the outside.

Answer: AC
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 89
Which statement about access lists that are applied to an interface is true?

A.    You can place as many access lists as you want on any interface.
B.    You can apply only one access list on any interface.
C.    You can configure one access list, per direction, per Layer 3 protocol.
D.    You can apply multiple access lists with the same protocol or in different directions.

Answer: C
Explanation:
We can have only 1 access list per protocol, per direction and per interface. It means:
+ We can not have 2 inbound access lists on an interface + We can have 1 inbound and 1 outbound access list on an interface

QUESTION 90
Which item represents the standard IP ACL?

A.    access-list 110 permit ip any any
B.    access-list 50 deny 192.168.1.1 0.0.0.255
C.    access list 101 deny tcp any host 192.168.1.1
D.    access-list 2500 deny tcp any host 192.168.1.1 eq 22

Answer: B
Explanation:
The standard access lists are ranged from 1 to 99 and from 1300 to 1999 so only access list 50 is a standard access list.


Learning The New PassLeader Cisco 200-120 Exam Questions For 100 Percent Passing

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