CCNA Practice Questions Part VIII

What is the default lease time for a DHCP binding?

24 hours.

In a GLBP network, who is responsible for the arp request?

AVG.

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

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

What are the two minimum required components of a DHCP binding?

An I P address and a hardware address.

What are two requirements for an HSRP group?

Exactly one active router and one or more standby routers.

What value is used during the HSRP election process?

HSRP election is based on a priority value from 0 to 255 that is configured on each router in the group. The default priority is 100. The router with the highest priority becomes the active router.

Which protocol is the Cisco proprietary implementation of FHRP?

HSRP.

After you configure the ip dns spoofing command globally on a device, under which two conditions is DNS spoofing enabled on the device?

If all configured I P name server addresses are removed, or if the no I P domain lookup command is configured.

During the HSRP election process, what happens if all of the routers in the group have the same router priority or all have the default router priority?

If all router priorities are equal or set to the default value, the router with the highest IP address on the HSRP interface becomes the active router.

What happens with conflicts when using DHCP?

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

Which HSRP feature was new in HSRPv2?

In HSRP version 1, group numbers are restricted to the range from 0 to 255. HSRP version 2 expands the group number range from 0 to 4095

Where does a switch maintain DHCP snooping information?

In the DHCP binding database.

If after configuring DHCP on a router, the clients behind the router cannot communicate outside their own subnet, what likely needs to be done?

In the DHCP pool you need to configure a default gateway via the "default-route" command for the DHCP clients to communicate with outside subnets.

In what order are the 6 steps of the DHCP client process?

Initializing, selecting, requesting, bound, renewing, and rebinding.

Which two types of NAT addresses are used in a Cisco NAT device?

Inside local, which is the I P address assigned to a host on the inside network, and and Inside global which is a legitimate I P address assigned by the InterNIC or service provider that represents one or more inside local I P addresses to the outside world.

What does DHCP snooping do?

It blocks traffic from DHCP on untrusted interfaces.

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

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

With DNS, what does the I P domain lookup source-interface do?

It enables DNS lookup on an individual interface.

With DNS, what does the I P DNS server do?

It enables the DNS server on a device.

With DNS, what does the I P name server do?

It identifies a DNS server to provide lookup services.

Name 2 benefits of using DHCP snooping.

It prevents the deployment of rogue DHCP servers and it tracks the location of hosts in the network.

With DNS, what is the I P domain list?

It specifies a sequence of domain names.

With DNS, what is an I P domain name?

It specifies the default domain to append to unqualified host names.

Which NTP type designates a router without an external reference clock as an authoritative time source?

Master.

Which three commands are required to enable NTP authentication on a Cisco router?

NTP authenticate, NTP trusted-key, and NTP authentication-key.

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

NTP master.

Where does the configuration reside when a helper address is configured to support DHCP?

On the router closest to the client.

What does QoS do with tagged packets?

Packets that arrive with a tag are untagged at the edge of an administrative domain.

When troubleshooting client DNS issues, which two tasks might you perform?

Ping the DNS server and determine whether the name servers have been configured.

Which keyword enables an HSRP router to take the active role immediately when it comes online?

Preempt.

While troubleshooting a DHCP client that is behaving erratically, you discover that the client has been assigned the same IP address as a printer that is a static IP address. Which option is the best way to resolve the problem?

Reserve the printer I P address.

Which two command can you enter to display the current time sources statistics on devices?

Show NTP associations and show NTP status.

Which cloud service is typically used to provide DNS and DHCP services to an enterprise?

Software as a Service, or SaaS.

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

Static NAT.

Which value indicates the distance from the NTP authoritative time source?

Stratum.

What does the preempt command do when using HSRP?

The "preempt" command enables the HSRP router with the highest priority to immediately become the active router.

Which command can you enter in global configuration mode to create a DHCP address pool?

ip dhcp pool DHCP_pool.

Give an example of a command you can enter to create a NAT pool of 6 addresses.

ip nat pool test 175.17.12.69 175.17.12.74 prefix-length 24

What command can you enter to configure the switch as an authoritative NTP server?

ntp master 3, using 3 in this example as the stratum. NTP stratum numbers range from 0 to 15 and - other than the actual number 15 - the higher the stratum number the more accurate and stable the timing is considered to be.

Which command can you enter to determine the addresses that have been assigned on a DHCP Server?

show I P DHCP binding.

Which command can you enter to troubleshoot the failure of address assignment?

show I P DHCP pool.

What command can you enter to verify that a router is synced with a configured time source?

show NTP associations.

Give an example of a command you can enter to display duplicate IP addresses that a DHCP server assigns.

show ip dhcp conflict 10.0.2.12.

What are two benefits of using NAT?

1) NAT protects network security because private networks are not advertised. 2) NAT eliminates the need to re-address all host that require external access.

What is new in HSRPv2?

A greater number in the HSRP group field.

What is the authoritative source for an address lookup?

A recursive DNS search.

What method does DHCP use to discover I P address conflicts?

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.

Which task must you perform to enable an IOS device to use DNS services?

Configure a name server.

What are the 4 DHCP steps?

D.O.R.A. Discover, Offer, Request, Acknowledge.

Which value is used to determine the active router in an HSRP default configuration?

The router's I P address.

With DNS, what is an I P host?

The static mapping of an I P address to a host name.

Give 2 characteristics of static NAT translations.

They allow connections to be initiated from the outside and they are always present in the NAT table.

What is DNS spoofing designed to do?

To allow a router to act as a proxy DNS server and "spoof" replies to any DNS queries using either the configured IP address in the I P dns spoofing ip-address command or the I P address of the incoming interface for the query.

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

Using permit any can result in NAT consuming too many router resources, which can cause network problems. You should limit the NAT access list to a specific range of IP addresses.

Which standards-based First Hop Redundancy Protocol is a Cisco supported alternative to Hot Standby Router Protocol?

Virtual Router Redundancy Protocol , or VRRP, is one of the First Hop Redundancy Protocols that is supported by Cisco. Unlike HSRP and GLBP, which are Cisco proprietary protocols, VRRP is an industry standard protocol.

What is true about the inside interface when configuring a NAT deployment?

When we specify a NAT "inside" interface, we are specifying the source IP addresses. Later in the "ip nat" command, we will specify the access or route map for these source addresses, such as : ip nat inside source list 1 pool PoolforNAT

Give an example of both an HSRP and and HSPRv2 virtual MAC address.

With HSRPv1, the virtual router's MAC address is 0000.0c07.ACxx , in which xx is the HSRP group. With HSRPv2, the virtual MAC address is 0000.0C9F.Fxxx, in which xxx is the HSRP group.