CCNA 1 v6.0 Chapter 7 Exam Answers 2018 (100%)

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Cisco CCNA 1 v6.0 Chapter 7 Exam Answers Score 100%

1. How many bits are in an IPv4 address?

32*

64

128

256

Explanation:
An IPv4 address is comprised of 4 octets of binary digits, each containing 8 bits, resulting in a 32-bit address.

2. Which two parts are components of an IPv4 address? (Choose two.)

subnet portion

network portion*

logical portion

host portion*

physical portion

broadcast portion

Explanation:
An IPv4 address is divided into two parts: a network portion – to identify the specific network on which a host resides, and a host portion – to identify specific hosts on a network. A subnet mask is used to identify the length of each portion.

3. What does the IP address 172.17.4.250/24 represent?

network address

multicast address

host address*

broadcast address

Explanation:
The /24 shows that the network address is 172.17.4.0. The broadcast address for this network would be 172.17.4.255. Useable host addresses for this network are 172.17.4.1 through 172.17.4.254.

4. What is the purpose of the subnet mask in conjunction with an IP address?

to uniquely identify a host on a network

to identify whether the address is public or private

to determine the subnet to which the host belongs*

to mask the IP address to outsiders

Explanation:
With the IPv4 address, a subnet mask is also necessary. A subnet mask is a special type of IPv4 address that coupled with the IP address determines the subnet of which the device is a member. ​

5. What subnet mask is represented by the slash notation /20?

255.255.255.248

255.255.224.0

255.255.240.0*

255.255.255.0

255.255.255.192

Explanation:
The slash notation /20 represents a subnet mask with 20 1s. This would translate to: 11111111.11111111.11110000.0000, which in turn would convert into 255.255.240.0.

6. A message is sent to all hosts on a remote network. Which type of message is it?

limited broadcast

multicast

directed broadcast*

unicast

Explanation:
A directed broadcast is a message sent to all hosts on a specific network. It is useful for sending a broadcast to all hosts on a nonlocal network. A multicast message is a message sent to a selected group of hosts that are part of a subscribing multicast group. A limited broadcast is used for a communication that is limited to the hosts on the local network. A unicast message is a message sent from one host to another.

7. What are three characteristics of multicast transmission? (Choose three.)

The source address of a multicast transmission is in the range of 224.0.0.0 to 224.0.0.255.

A single packet can be sent to a group of hosts.*

Multicast transmission can be used by routers to exchange routing information.*

The range of 224.0.0.0 to 224.0.0.255 is reserved to reach multicast groups on a local network.*

Computers use multicast transmission to request IPv4 addresses.

Multicast messages map lower layer addresses to upper layer addresses.

Explanation:
Broadcast messages consist of single packets that are sent to all hosts on a network segment. These types of messages are used to request IPv4 addresses, and map upper layer addresses to lower layer addresses. A multicast transmission is a single packet sent to a group of hosts and is used by routing protocols, such as OSPF and RIPv2, to exchange routes. The address range 224.0.0.0 to 224.0.0.255 is reserved for link-local addresses to reach multicast groups on a local network.

8. Which three IP addresses are private ? (Choose three.)

10.1.1.1*

172.32.5.2

192.167.10.10

172.16.4.4*

192.168.5.5*

224.6.6.6

Explanation:
The private IP addresses are within these three ranges:
10.0.0.0 – 10.255.255.255
172.16.0.0 – 172.31.255.255
192.168.0.0 – 192.168.255.255

9. Which two IPv4 to IPv6 transition techniques manage the interconnection of IPv6 domains? (Choose two.)

trunking

dual stack*

encapsulation

tunneling*

multiplexing

Explanation:
There are three techniques to allow IPv4 and IPv6 to co-exist on a network. Dual stack allows IPv4 and IPv6 to coexist on the same network segment. Dual stack devices run both IPv4 and IPv6 protocol stacks simultaneously. Tunneling is a method of transporting an IPv6 packet over an IPv4 network. The IPv6 packet is encapsulated inside an IPv4 packet, similar to other types of data. Network Address Translation 64 (NAT64) allows IPv6-enabled devices to communicate with IPv4-enabled devices using a translation technique similar to NAT for IPv4.

10. Which of these addresses is the shortest abbreviation for the IP address:

3FFE : 1044 : 0000 : 0000 : 00AB : 0000 : 0000 : 0057?

3FFE : 1044 :: AB :: 57

3FFE : 1044 :: 00AB :: 0057

3FFE : 1044 : 0 : 0 : AB :: 57*

3FFE : 1044 : 0 : 0 : 00AB :: 0057

3FFE : 1044 : 0000 : 0000 : 00AB :: 57

3FFE : 1044 : 0000 : 0000 : 00AB :: 0057

11. What type of address is automatically assigned to an interface when IPv6 is enabled on that interface?

global unicast

link-local*

loopback

unique local

Explanation:
When IPv6 is enabled on any interface, that interface will automatically generate an IPv6 link-local address.

12. What are two types of IPv6 unicast addresses? (Choose two.)

multicast

loopback*

link-local*

anycast

broadcast

Explanation:
Multicast, anycast, and unicast are types of IPv6 addresses. There is no broadcast address in IPv6. Loopback and link-local are specific types of unicast addresses.

13. What are three parts of an IPv6 global unicast address? (Choose three.)

an interface ID that is used to identify the local network for a particular host

a global routing prefix that is used to identify the network portion of the address that has been provided by an ISP*

a subnet ID that is used to identify networks inside of the local enterprise site*

a global routing prefix that is used to identify the portion of the network address provided by a local administrator

an interface ID that is used to identify the local host on the network*

Explanation:
There are three elements that make up an IPv6 global unicast address. A global routing prefix which is provided by an ISP, a subnet ID which is determined by the organization, and an interface ID which uniquely identifies the interface interface of a host.

14. An administrator wants to configure hosts to automatically assign IPv6 addresses to themselves by the use of Router Advertisement messages, but also to obtain the DNS server address from a DHCPv6 server. Which address assignment method should be configured?

SLAAC

stateless DHCPv6*

stateful DHCPv6

RA and EUI-64

Explanation:
Stateless DHCPv6 allows clients to use ICMPv6 Router Advertisement (RA) messages to automatically assign IPv6 addresses to themselves, but then allows these clients to contact a DHCPv6 server to obtain additional information such as the domain name and address of DNS servers. SLAAC does not allow the client to obtain additional information through DHCPv6, and stateful DHCPv6 requires that the client receive its interface address directly from a DHCPv6 server. RA messages, when combined with an EUI-64 interface identifier, are used to automatically create an interface IPv6 address, and are part of both SLAAC and stateless DHCPv6.

15. Which protocol supports Stateless Address Autoconfiguration (SLAAC) for dynamic assignment of IPv6 addresses to a host?

ARPv6

DHCPv6

ICMPv6*

UDP

Explanation:
SLAAC uses ICMPv6 messages when dynamically assigning an IPv6 address to a host. DHCPv6 is an alternate method of assigning an IPv6 addresses to a host. ARPv6 does not exist. Neighbor Discovery Protocol (NDP) provides the functionality of ARP for IPv6 networks. UDP is the transport layer protocol used by DHCPv6.

16. Which two things can be determined by using the ping command? (Choose two.)

the number of routers between the source and destination device

the IP address of the router nearest the destination device

the average time it takes a packet to reach the destination and for the response to return to the source*

the destination device is reachable through the network*

the average time it takes each router in the path between source and destination to respond

Explanation:
A ping command provides feedback on the time between when an echo request was sent to a remote host and when the echo reply was received. This can be a measure of network performance. A successful ping also indicates that the destination host was reachable through the network.

17. What is the purpose of ICMP messages?

to inform routers about network topology changes

to ensure the delivery of an IP packet

to provide feedback of IP packet transmissions*

to monitor the process of a domain name to IP address resolution

Explanation:
The purpose of ICMP messages is to provide feedback about issues that are related to the processing of IP packets.

18. What is indicated by a successful ping to the ::1 IPv6 address?

The host is cabled properly.

The default gateway address is correctly configured.

All hosts on the local link are available.

The link-local address is correctly configured.

IP is properly installed on the host.*

Explanation:
The IPv6 address ::1 is the loopback address. A successful ping to this address means that the TCP/IP stack is correctly installed. It does not mean that any addresses are correctly configured.

19. A user is executing a tracert to a remote device. At what point would a router, which is in the path to the destination device, stop forwarding the packet?

when the router receives an ICMP Time Exceeded message

when the RTT value reaches zero

when the host responds with an ICMP Echo Reply message

when the value in the TTL field reaches zero*

when the values of both the Echo Request and Echo Reply messages reach zero

Explanation:
When a router receives a traceroute packet, the value in the TTL field is decremented by 1. When the value in the field reaches zero, the receiving router will not forward the packet, and will send an ICMP Time Exceeded message back to the source.

20. What field content is used by ICMPv6 to determine that a packet has expired?

TTL field

CRC field

Hop Limit field*

Time Exceeded field

Explanation:
ICMPv6 sends a Time Exceeded message if the router cannot forward an IPv6 packet because the packet expired. The router uses a hop limit field to determine if the packet has expired, and does not have a TTL field.

21. Fill in the blank.

The decimal equivalent of the binary number 10010101 is 149 .

22. Fill in the blank.
The binary equivalent of the decimal number 232 is 11101000

23. Fill in the blank.
What is the decimal equivalent of the hex number 0x3F? 63

Explanation:
Hex 0x3F is 63 in decimal.
(3*16)+(15*1) = 63

24. Match each description with an appropriate IP address. (Not all options are used.)

169.254.1.5 -> a link-local address
192.0.2.123 -> a TEST-NET address
240.2.6.255 -> an experimental address
172.19.20.5 -> a private address
127.0.0.1 -> a loopback address

Explanation:
Link-Local addresses are assigned automatically by the OS environment and are located in the block 169.254.0.0/16. The private addresses ranges are 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. TEST-NET addresses belong to the range 192.0.2.0/24. The addresses in the block 240.0.0.0 to 255.255.255.254 are reserved as experimental addresses. Loopback addresses belong to the block 127.0.0.0/8.

New Questions update 2019

25. What is the binary equivalent of the decimal number 232?

11101000*
11000110
10011000
11110010

Explanation:

232 in binary is 11101000. 128+64+32+8 = 232

26. What is the decimal equivalent of the binary number 10010101?

149*
157
168
192

Explanation:
Binary 10010101 maps to 149 in decimal. 128+16+4+1 = 149

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