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CCNA Routing and Switching v3.0

QUESTION 211

Which two of these statements are true of IPv6 address representation? (Choose two.)

 

A.

There are four types of IPv6 addresses: unicast, multicast, anycast, and broadcast.

B.

A single interface may be assigned multiple IPv6 addresses of any type.

C.

Every IPv6 interface contains at least one loopback address.

D.

The first 64 bits represent the dynamically created interface ID.

E.

Leading zeros in an IPv6 16 bit hexadecimal field are mandatory.

 

Correct Answer: BC

Explanation:

A single interface may be assigned multiple addresses of any type (unicast, anycast, multicast).

Every IPv6-enabled interface must contain at least one loopback and one link-local address.

Optionally, every interface can have multiple unique local and global addresses.

Reference: IPv6 Addressing at a Glance ?Cisco PDF

 

 

QUESTION 212

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.

 

Correct Answer: D

Explanation:

The DHCP lifecycle consists of the following:

Allocation: A client begins with no active lease, and hence, no DHCP-assigned address. It acquires a lease through a process of allocation. Reallocation: If a client already has an address from an existing lease, then when it reboots or starts up after being shut down, it will contact the DHCP server that granted it the lease to confirm the lease and acquire operating parameters. This is sometimes called reallocation; it is similar to the full allocation process but shorter. Normal Operation: Once a lease is active, the client functions normally, using its assigned IP address and other parameters during the “main part” of the lease. The client is said to be bound to the lease and the address. Renewal: After a certain portion of the lease time has expired, the client will attempt to contact the server that initially granted the lease, to renew the lease so it can keep using its IP address.

Rebinding. If renewal with the original leasing server fails (because, for example, the server has been taken offline), then the client will try to rebind to any active DHCP server, trying to extend its current lease with any server that will allow it to do so.

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 213

Refer to the exhibit. In this VLSM addressing scheme, what summary address would be sent from router A?

 

clip_image001

 

A.

172.16.0.0 /16

B.

172.16.0.0 /20

C.

172.16.0.0 /24

D.

172.32.0.0 /16

E.

172.32.0.0 /17

F.

172.64.0.0 /16

Correct Answer: A

Explanation:

Router A receives 3 subnets: 172.16.64.0/18, 172.16.32.0/24 and 172.16.128.0/18. All these 3 subnets have the same form of 172.16.x.x so our summarized subnet must be also in that form -> Only A, B or .

The smallest subnet mask of these 3 subnets is /18 so our summarized subnet must also have its subnet mask equal or smaller than /18. > Only answer A has these 2 conditions ->.

 

 

QUESTION 214

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

 

Correct 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 215

The network administrator has been asked to give reasons for moving from IPv4 to IPv6. What are two valid reasons for adopting IPv6 over IPv4? (Choose two.)

 

A.

no broadcast

B.

change of source address in the IPv6 header

C.

change of destination address in the IPv6 header

D.

Telnet access does not require a password

E.

autoconfiguration

F.

NAT

 

Correct Answer: AE

Explanation:

IPv6 does not use broadcasts, and autoconfiguration is a feature of IPV6 that allows for hosts to automatically obtain an IPv6 address.

 

 

QUESTION 216

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

 

Correct 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 217

In GLBP, which router will respond to client ARP requests?

 

A.

The active virtual gateway will reply with one of four possible virtual MAC addresses.

B.

All GLBP member routers will reply in round-robin fashion.

C.

The active virtual gateway will reply with its own hardware MAC address.

D.

The GLBP member routers will reply with one of four possible burned in hardware addresses.

 

Correct Answer: A

Explanation:

One disadvantage of HSRP and VRRP is that only one router is in use, other routers must wait for the primary to fail because they can be used. However, Gateway Load Balancing Protocol (GLBP) can use of up to four routers simultaneously. In GLBP, there is still only one virtual IP address but each router has a different virtual MAC address. First a GLBP group must elect an Active Virtual Gateway (AVG). The AVG is responsible for replying ARP requests from hosts/clients. It replies with different virtual MAC addresses that correspond to different routers (known as Active Virtual Forwarders ?AVFs) so that clients can send traffic to different routers in that GLBP group (load sharing).

 

 

QUESTION 218

Which three are characteristics of an IPv6 anycast address? (Choose three.)

 

A.

one-to-many communication model

B.

one-to-nearest communication model

C.

any-to-many communication model

D.

a unique IPv6 address for each device in the group

E.

the same address for multiple devices in the group

F.

delivery of packets to the group interface that is closest to the sending device

 

Correct Answer: BEF

Explanation:

A new address type made specifically for IPv6 is called the Anycast Address. These IPv6 addresses are global addresses, these addresses can be assigned to more than one interface unlike an IPv6 unicast address. Anycast is designed to send a packet to the nearest interface that is a part of that anycast group. The sender creates a packet and forwards the packet to the anycast address as the destination address which goes to the nearest router. The nearest router or interface is found by using the metric of a routing protocol currently running on the network. However in a LAN setting the nearest interface is found depending on the order the neighbors were learned. The anycast packet in a LAN setting forwards the packet to the neighbor it learned about first.

 

 

QUESTION 219

What is a valid HSRP virtual MAC address?

 

A.

0000.5E00.01A3

B.

0007.B400.AE01

C.

0000.0C07.AC15

D.

0007.5E00.B301

 

Correct Answer: C

Explanation:

With HSRP, two or more devices support a virtual router with a fictitious MAC address and unique IP address. There are two version of HSRP.

 

+ With HSRP version 1, the virtual router’s MAC address is 0000.0c07.ACxx , in which xx is the HSRP group.

+ With HSRP version 2, the virtual MAC address if 0000.0C9F.Fxxx, in which xxx is the HSRP group.

 

Note: Another case is HSRP for IPv6, in which the MAC address range from 0005.73A0.0000 through 0005.73A0.0FFF.

 

 

QUESTION 220

Which subnet mask would be appropriate for a network address range to be subnetted for up to eight LANs, with each LAN containing 5 to 26 hosts?

 

A.

0.0.0.240

B.

255.255.255.252

C.

255.255.255.0

D.

255.255.255.224

E.

255.255.255.240

 

Correct Answer: D

Explanation:

For a class C network, a mask of 255.255.255.224 will allow for up to 8 networks with 32 IP addresses each (30 usable).

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