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CCNA Routing and Switching v3.0

QUESTION 201

Which of these represents an IPv6 link-local address?

 

A.

FE80::380e:611a:e14f:3d69

B.

FE81::280f:512b:e14f:3d69

C.

FEFE:0345:5f1b::e14d:3d69

D.

FE08::280e:611:a:f14f:3d69

 

Correct Answer: A

Explanation:

In the Internet Protocol Version 6 (IPv6), the address block fe80::/10 has been reserved for link-local unicast addressing. The actual link local addresses are assigned with the prefix fe80::/64. They may be assigned by automatic (stateless) or stateful (e.g. manual) mechanisms.

 

 

QUESTION 202

What command instructs the device to timestamp Syslog debug messages in milliseconds?

 

A.

service timestamps log datetime localtime<input type

B.

service timestamps debug datetime msec<input type

C.

service timestamps debug datetime localtime<input type

D.

service timestamps log datetime msec

 

Correct Answer: B

Explanation:

Enable millisecond (msec) times
tamps using the service timestamps command:

 

router(config)#service timestamps debug datetime msec.

router(config)#service timestamps log datetime msec

The “service timestamps debug”. command configures the system to apply a time stamp to debugging messages. The time-stamp format for datetime is MMM DD HH:MM:SS, where MMM is the month, DD is the date, HH is the hour (in 24-hour notation), MM is the minute, and SS is the second. With the additional keyword msec, the system includes milliseconds in the time stamp, in the format HH:DD:MM:SS.mmm, where .mmm is milliseconds.

 

 

QUESTION 203

What is the first 24 bits in a MAC address called?

 

A.

NIC

B.

BIA

C.

OUI

D.

VAI

 

Correct Answer: C

Explanation:

An Organizationally Unique Identifier (OUI) is a 24-bit number that uniquely identifies a vendor, manufacturer, or other organization globally or worldwide. They are used as the first 24 nits of the MAC address to uniquely identify a particular piece of equipment.

 

 

QUESTION 204

How is an EUI-64 format interface ID created from a 48-bit MAC address?

 

A.

by appending 0xFF to the MAC address

B.

by prefixing the MAC address with 0xFFEE

C.

by prefixing the MAC address with 0xFF and appending 0xFF to it

D.

by inserting 0xFFFE between the upper three bytes and the lower three bytes of the MAC address

E.

by prefixing the MAC address with 0xF and inserting 0xF after each of its first three bytes

 

Correct Answer: D

Explanation:

The modified EUI-64 format interface identifier is derived from the 48-bit link-layer (MAC) address by inserting the hexadecimal number FFFE between the upper three bytes (OUI field) and the lower three bytes (serial number) of the link layer address.

 

 

QUESTION 205

Which command enables IPv6 forwarding on a Cisco router?

 

A.

ipv6 local

B.

ipv6 host

C.

ipv6 unicast-routing

D.

ipv6 neighbor

 

Correct Answer: C

Explanation:

To enable IPv6 routing on the Cisco router use the following command:

ipv6 unicast-routing

If this command is not recognized, your version of IOS does not support IPv6.

 

 

QUESTION 206

Refer to the exhibit. What is the cause of the Syslog output messages?

 

clip_image002

 

A.

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

B.

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

C.

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

D.

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

 

Correct Answer: C

Explanation:

The first lines of the message show that a configuration change was made, and that the fa0/1 interface changed to a state of administratively down. This can only be done by issuing the shutdown command. The last line indicates that this caused an EIGRP neighbor adjacency to go down.

 

 

QUESTION 207

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

 

A.

The virtual IP address and virtual MA+K44C address are active on the HSRP Master router.

B.

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

C.

HSRP supports only clear-text authentication.

D.

The HSRP virtual IP address must be on a different subnet than the routers’ interfaces on the same LAN.

E.

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

F.

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

 

Correct Answer: ABF

Explanation:

The virtual MAC address of HSRP version 1 is 0000.0C07.ACxx, where xx is the HSRP group number in hexadecimal based on the respective interface. For example, HSRP group
10 uses the HSRP virtual MAC address of 0000.0C07.AC0A. HSRP version 2 uses a virtual MAC address of 0000.0C9F.FXXX (XXX: HSRP group in hexadecimal).

 

 

QUESTION 208

Which command can you use to manually assign a static IPv6 address to a router interface?

 

A.

ipv6 autoconfig 2001:db8:2222:7272::72/64

B.

ipv6 address 2001:db8:2222:7272::72/64

C.

ipv6 address PREFIX_1 ::1/64

D.

ipv6 autoconfig

 

Correct Answer: B

Explanation:

To assign an IPv6 address to an interface, use the “ipv6 address” command and specify the IP address you wish to use.

 

 

QUESTION 209

Refer to the exhibit. Which subnet mask will place all hosts on Network B in the same subnet with the least amount of wasted addresses?

 

clip_image003

 

A.

255.255.255.0

B.

255.255.254.0

C.

255.255.252.0

D.

255.255.248.0

 

Correct Answer: B

Explanation:

310 hosts < 512 = 29 -> We need a subnet mask of 9 bits 0 -> 1111 1111.1111 1111.1111 1110.0000 0000 -> 255.255.254.0

 

 

QUESTION 210

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.

 

Correct 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.

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