Lernkartei CCNA 200-125 (Seite 7 von 12)

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Which two statements about using the CHAP authentication mechanism in a PPP link are true?

CHAP authentication periodically occurs after link establishment.

CHAP authentication is performed only upon link establishment.

CHAP uses a twoway handshake.

CHAP uses a threeway handshake

CHAP has no protection from playback attacks.

Which are three reasons that an organization with multiple branch offices and roaming users might implement a Cisco VPN solution instead of point-to-point WAN links? (Select three)

broadband incompatibility

scalability

increased security

reduced latency

reduced cost

Which statement is correct regarding the operation of DHCP?

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

A DHCP client uses a ping to detect address conflicts.

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

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

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

What is a valid HSRP virtual MAC address?

0000.0C07.AC15

0007.5E00.B301

0000.5E00.01A3

0007.B400.AE01

Which NTP command configures the local device as an NTP reference clock source?

ntp master

ntp peer

ntp broadcast

ntp server

Which NAT type is used to translate a single inside address to a single outside address?

NAT overload

dynamic NAT

static NAT

PAT

What are two requirements for an HSRP group? (Choose two.)

One or more backup virtual routers.

Exactly one standby active router.

One or more standby routers.

Exactly one backup virtual router.

Exactly one active router.

Which command can you enter to display the hits counter for NAT traffic?

show ip nat statistics

debug ip nat

show ip debug nat

clear ip nat statistics

Which option describes the purpose of traffic policing?

It prioritizes routing protocol traffic.

It queues and then transmits traffic that exceeds the CIR.

It remarks traffic that is below the CIR.

It drops traffic that exceeds the CIR.

What is the authoritative source for an address lookup?

A recursive DNS search

The ISP local cache

The browser cache

The operating system cache

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

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

They are always present in the NAT table.

They allow connection to be initiated from the outside.

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

What authentication type is used by SNMPv2?

CBC-DES

HMAC-SHA

community strings

HMAC-MD5

Which protocol advertises a virtual IP address to facilitate transparent failover of a Cisco routing device?

DHCP

ESRP

RSMLT

FHRP

Which NAT function can map multiple inside addresses to a single outside address?

TFTP

RARP

PAT

SFTP

ARP

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

TRAP

GET

CAPTURE

RESPONSE

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

Broadcast address on the network

Designated IP address to the DHCP server

IP address used by the interfaces

Manually assigned address to the clients

Network or subnetwork IP address

View the exhibit. What is the cause of the Syslog output messages?

A shut command was executed on interface Fa0/1, causing the EIGRP adjacency to go down.

Interface Fa0/1 has become error disabled, causing the EIGRP adjacency to go down.

The EIGRP neighbor on Fa0/1 went down due to a failed link.

The EIGRP neighbor connected to Fa0/1 is participating in a different EIGRP process, causing the adjacency to go down.

Which three statements about HSRP operation are true? (Choose three)

HSRP supports up to 255 groups per interface, enabling an administrative form of load balancing.

The HSRP default timers are a 3 second hello interval and a 10 second dead interval.

HSRP supports only clear-text authentication.

The virtual IP address and virtual MAC address are active on the HSRP Master router.

The HSRP virtual IP address must be the same as one of the router interface addresses on the LAN.

What is the danger of the permit any entry in a NAT access list?

It can cause too many addresses to be assigned to the same interface.

It prevents the correct translation of IP addresses on the inside network.

It can disable the overload command.

It can lead to overloaded resources on the router.

Which protocol is the Cisco proprietary implementation of FHRP?

GLBP

VRRP

CARP

HSRP

What does the keyword overload signify in the configuration of NAT?

The pool of IP addresses has been exhausted.

If the number of available IP addresses is exceeded, excess traffic will use the specified address pool.

Multiple internal hosts will use one IP address to access external network resources.

When bandwidth is insufficient, some hosts will not be allowed to access network translation.

Which option is the benefit of implementing an intelligent DNS for a cloud computing solution?

It can redirect user requests to locations that are using fewer network resources.

It enables the ISP to maintain DNS records automatically.

It reduces the need for a backup data center.

It eliminates the need for a GSS.

Which function of the IP SLAs ICMP jitter operation can you use to determine whether a VoIP issue is caused by excessive end-to-end time?

Packet loss

Round-trip time latency

Jitter

Successive packet loss

Which statement is correct regarding the operation of DHCP?

A DHCP client uses a ping to detect address conflicts.

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

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

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

A DHCP server uses a ping to detect address conflicts.

View the exhibit. The DHCP settings have recently been changed on the DHCP server and the client is no longer able to reach network resources. What should be done to correct this situation?

Verify that the DNS server address is correct in the DHCP pool.

Clear all DHCP leases on the router to prevent address conflicts.

Use the tracert command on the DHCP client to first determine where the problem is located.

Issue the ipconfig command with the /release and /renew options in a command window.

Ping the default gateway to populate the ARP cache.

What are two benefits of using NAT? (Choose two)

NAT protects network security because private networks are not advertised.

NAT accelerates the routing process because no modifications are made on the packets.

NAT conserves addresses through host MAC-level multiplexing.

NAT eliminates the need to re-address all host that require external access.

NAT facilitates end-to-end communication when IPsec is enabled.

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

when the network must route UDP traffic.

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

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

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

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

Addresses are allocated after a negotiation between the server and the host to determine the length of the agreement.

Addresses are leased to hosts. A host will usually keep the same address by periodically contacting the DHCP server to renew the lease.

Addresses are permanently assigned so that the hosts uses the same address at all times.

Addresses are assigned for a fixed period of time, at the end of the period, a new request for an address must be made.

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

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

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

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

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

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

What is the first step in the NAT configuration process?

Define public and private IP addresses.

Define IP address pools.

Define inside and outside interfaces.

Define global and local interfaces.

When a router makes a routing decision for a packet that is received from one network and destined to another, which portion of the packet does it replace?

Layer 2 frame header and trailer

Layer 5 session

Layer 4 protocol

Layer 3 IP address

Which statement about the inside interface configuration in a NAT deployment is true?

It identifies the location of source addresses for outgoing packets to be translated using access or route maps.

It must be configured if static NAT is used.

It is defined globally.

It identifies the public IP address that traffic will use to reach the internet.

Which logging command can enable administrators to correlate syslog messages with millisecond precision?

no logging monitor

logging host 10.2.0.21

logging buffered 4

no logging console

service timestamps log datetime mscec

View the exhibit. What statement is true of the configuration for this network?

ExternalRouter must be configured with static routes to networks 172.16.1.0/24 and 172.16.2.0/24.

The number 1 referred to in the ip nat inside source command references access-list number 1.

Because of the addressing on interface FastEthernet0/1, the Serial0/0 interface address will not support the NAT configuration as shown.

The configuration that is shown provides inadequate outside address space for translation of the number of inside addresses that are supported.

Which one of these is a valid HSRP Virtual Mac Address?

0000.1010.ac0c

2b00.bc10.010c

0000.0c07.ac0c

00ac.b280.ac0c

Which three options are the HSRP states for a router? (Choose three.)

Secondary

Learn

Listen

Speak

Primary

Which type of address is the public IP address of a NAT device?

inside global

outside public

inside local

outside local

inside public

Which feature can you implement to reserve bandwidth for VoIP calls across the call path?

PQ

Round robin

RSVP

CBWFQ

Which two tasks does the Dynamic Host Configuration Protocol perform? (Select two)

Configure IP address parameters from DHCP server to a host.

Monitor IP performance using the DHCP server.

Perform host discovery used DHCPDISCOVER message.

Set the IP gateway to be used by the network.

Assign and renew IP address from the default pool.

What is the default lease time for a DHCP binding?

24 hours

12 hours

48 hours

36 hours

CCNA 200-125

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