ITN Chapter 8 Exam

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How many bits are in an IPv4 address?

32

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

network portion
host portion

(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.)

What is the prefix length notation for the subnet mask 255.255.255.224?

/27

(The binary format for 255.255.255.224 is 11111111.11111111.11111111.11100000. The prefix length is the number of consecutive 1s in the subnet mask. Therefore, the prefix length is /27.)

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

(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.)

What two statements describe characteristics of Layer 3 broadcasts? (Choose two.)

(Broadcasts are used by a number of protocols and cannot be avoided. A router does not forward broadcasts, thus creating a broadcast domain in each one of its interfaces. There are no broadcasts in IPv6. If a switch receives a broadcast packet, it will forward this packet through all of its interfaces, except the inbound interface)

A DHCP server is used to assign IP addresses dynamically to the hosts on a network. The address pool is configured with 192.168.10.0/24. There are 3 printers on this network that need to use reserved static IP addresses from the pool. How many IP addresses in the pool are left to be assigned to other hosts?

(If the block of addresses allocated to the pool is 192.168.10.0/24, there are 254 IP addresses to be assigned to hosts on the network. As there are 3 printers which need to have their addresses assigned statically, then there are 251 IP addresses left for assignment.)

Which two statements are correct about IPv4 and IPv6 addresses? (Choose two.)

(IPv4 addresses are represented as dotted decimal numbers and are 32 bits in length. IPv6 addresses are represented by hexadecimal numbers and are 128 bits in length.)

Which IPv6 address is most compressed for the full FE80:0:0:0:2AA:FF:FE9A:4CA3 address?​

(When an IPv6 address is being compressed, the :: can be used to replace a recurring set of 0s only once.)

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

(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.)

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

(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.)

An IPv6 enabled device sends a data packet with the destination address of FF02::1. What is the target of this packet?

(FF02::1 is the all-nodes multicast group within the scope of the local link. A packet with this destination address is received and processed by all IPv6-enabled interfaces.)

When a Cisco router is being moved from an IPv4 network to a complete IPv6 environment, which series of commands would correctly enable IPv6 forwarding and interface addressing?

...

Which two ICMP messages are used by both IPv4 and IPv6 protocols? (Choose two.)​

(The ICMP messages common to both ICMPv4 and ICMPv6 include: host confirmation, destination (net, host, protocol, port) or service unreachable, time exceeded, and route redirection. Router solicitation, neighbor solicitation, and router advertisement are new protocols implemented in ICMPv6.)

When will a router drop a traceroute packet?

(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.)

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

(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.)

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

...

Fill in the blank.
The decimal equivalent of the binary number 10010101 is

(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.)

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

(To convert from hexadecimal to decimal, multiply each digit by the place value that is associated with the position of the digit and add the results.)

match each IPv4 address to the appropriate address category ( not all are used )

To determine whether a given IPv4 address is a network, host, or broadcast address, first determine the address space based on the subnet mask. Convert the address and mask to binary values, and AND to determine the network address. To calculate the of the address space, use the number of host bits in the subnet mask as an exponent of 2. The number of valid host addresses in the space is that number minus 2. The network address will have all zeroes in the host portion, and the broadcast address will have all ones. For example, 10.0.50.10/30 yields a network IP address of 10.0.50.8 when the mask is ANDed with the given address. Because there are only 2 host bits in the mask, there are only 2 valid host addresses (4-2). 10.0.50.10 is one of the two valid host IP addresses.

Open the PT Activity. Perform the tasks in the activity instructions and then answer the question.

The correct configuration is:
interface fa0/0
ipv6 address 2001:db8:1234:1::1/64
end

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