Networking Basics 8 - 11
Which type of packet is sent by a DHCP server after receiving a DHCP Discover message?
DHCP Offer. When a DHCP server receives a DHCP Discover packet from a client, the server responds with a DHCP Offer packet to let the client know that an IP address is available and reserved for the client.
Which IPv6 address notation is valid?
IPv6 addresses are represented by 32 hexadecimal digits (0-9, A-F). The size of the notation can be reduced by eliminating leading zeroes in any hextet and by replacing a single, contiguous string of hextets containing all zeroes with a double colon, which can only be used one time.
A host PC is attempting to lease an address through DHCP. What message is sent by the server to let the client know it is able to use the provided IP information?
When a host uses DHCP to automatically configure an IP address, the typically sends two messages: the DHCPDISCOVER message and the DHCPREQUEST message. These two messages are usually sent as broadcasts to ensure that all DHCP servers receive them. The servers respond to these messages using DHCPOFFER, DHCPACK, and DHCPNACK messages, depending on the circumstance.
The IT group needs to design and deploy IPv4 network connectivity in a new high school computer lab. The network design requires multiple logical networks be deployed on one physical network. Which technology is required to enable computers on different logical networks to communicate with each other?
With IPv4 addressing, multiple logical networks can exist on one physical network if the network portion of the logical network host addresses is different. The hosts with the same network number in their IPv4 addresses will be able to communicate with each other but will not be able to communicate with the other hosts without the use of routing.
What does a double colon (::) represent in an IPv6 address notation?
a continuous string of one or more hextets that contain only zeros. To help reduce the notation of IPv6 addresses a double colon (::) can replace any single, contiguous string of one or more hextets consisting of all zeros. Only one instance of the double colon can be used in any IPv6 notation.
A technician is setting up equipment on a network. Which three devices will need IP addresses?(Choose three.)
a printer with an integrated NIC a server with two NICs an IP phone
A message is sent to all hosts on a remote network. Which type of message is it?
directed broadcast. 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.
Which letter represents the hexadecimal value of the decimal number 15?
f. The hexadecimal numbers are 0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f. The hexadecimal number 0 represents 0 in decimal and is represented as 0000 in binary. The hexadecimal number f represents 15 in decimal.
Which two parts are components of an IPv4 address? (Choose two.)
host portion. network portion
What is an advantage of using IPv6 ?
more addresses for networks and hosts
Which network device can serve as a boundary to divide a Layer 2 broadcast domain?
router. Layer 1 and 2 devices (LAN switch and Ethernet hub) and access point devices do not filter MAC broadcast frames. Only a Layer 3 device, such as a router, can divide a Layer 2 broadcast domain.
Match each description with an appropriate IP address.
127.0.0.1Loopback address 240.2.6.255An experimental address 198.133.219.2 A public address 169.254.1.5A link-local address
IPv6 increases the IP address size from 32 bits to how many bits?
128. IPv6 increases the size of the address from 32 bits in IPv4 to 128 bits.
What is the network number for an IPv4 address 172.16.34.10 with the subnet mask of 255.255.255.0?
172.16.34.0
Consider the group of five IPv4 addresses each with the subnet mask of 255.255.255.0. Which two IPv4 addresses belong to the same local network? (Choose two.)
192.168.10.56 192.168.10.2
Which destination IPv4 address does a DHCPv4 client use to send the initial DHCP Discover packet when the client is looking for a DHCP server?
255.255.255.255
How large are IPv4 addresses?
32 bits
How many octets exist in an IPv4 address?
4
What are two features of IPv4 addresses? (Choose two.)
IPv4 is a logical addressing scheme. An IPv4 addressing scheme is hierarchical.
What is one advantage of using DHCP to assign addresses to mobile devices?
A benefit of DHCP is that an address is not permanently assigned to a host but is only leased for a period of time. If the host is powered down or taken off the network, the address is returned to the pool for reuse. This is especially helpful with mobile users that come and go on a network.
A host is transmitting a broadcast. Which host or hosts will receive it?
A broadcast is delivered to every host that has an IP address within the same network.
Place the options in the following order:
A client initiating a message to find a DHCP server DHCPDISCOVER A DHCP server responding to the initial request by a client DHCPOFFER The client accepting the IP address provided by the DHCP server DHCPREQUEST The DHCP server confirming that the address lease has been accepted DHCPACK
Which statement describes the relationship of a physical network and logical IPv4 addressed networks?
A physical network can connect multiple devices of different IPv4 logical networks.
Which statement describes one purpose of the subnet mask setting for a host?
An IPv4 address contains two portions. The network portion defines the network (or a subnet) where the host is located and the host portion identifies the host address on the network. The subnet mask is used to define the network portion of the IPv4 addressing through the logical ANDing of the IP address and the subnet mask.
Which two reasons generally make DHCP the preferred method of assigning IP addresses to hosts on large networks? (Choose two.)
DHCP is generally the preferred method of assigning IP addresses to hosts on large networks because it reduces the burden on network support staff and virtually eliminates entry errors. However, DHCP itself does not discriminate between authorized and unauthorized devices and will assign configuration parameters to all requesting devices. DHCP servers are usually configured to assign addresses from a subnet range, so there is no guarantee that every device that needs an address will get one.
Which type of server dynamically assigns an IP address to a host?
DHCP servers can be computers or networking devices that are configured to assign IPv4 addresses to network connected devices.
Which message does an IPv4 host use to reply when it receives a DHCPOFFER message from a DHCP server?
DHCPOFFER
A PC is configured with both an IPv4 and IPv6 address on the same network adapter. What IPv4 and IPv6 coexistence strategy is implemented on the PC?
Dual stack. When a device is configured with both IPv4 and IPv6 protocol stacks, the device is implementing a dual stack strategy.
What criterion must be followed in the design of an IPv4 addressing scheme for end devices?
Each IP address must be unique within the local network.
What is the role of IANA?
Four very important organizations that create and maintain open standards are: The Internet Assigned Numbers Authority (IANA) oversees and manages the allocation of IP addresses and domain names to preserve their uniqueness. The Electronic Industries Alliance (EIA) maintains standards related to wiring and connectors to ensure cabling interoperability between different devices. The Internet Engineering Task Force (IETF) maintains the technologies and protocols used on the internet, such as TCP/IP. The Internet Society (ISOC) promotes the use of the internet around the world.
Which two statements are correct about IPv4 and IPv6 addresses? (Choose two.)
IPv4 addresses are 32 bits in length. IPv6 addresses are represented by hexadecimal numbers.
A user is unable to access the company server from a computer. On issuing the ipconfig command, the user finds that the IP address of the computer is displayed as 169.254.0.2. What type of address is this?
IPv4 addresses in the address block 169.254.0.0 to 169.254.255.255 are link-local addresses. The operating system of a host can automatically assign an address from this block to the host in case no IP configuration is available. An example is when a host is configured to obtain a dynamic IP address but cannot reach any DHCP server during the boot process. In such a case, the operating system can assign a link-local address.
Which address prefix range is reserved for IPv4 multicast?
Multicast IPv4 addresses use the reserved class D address range of 224.0.0.0 to 239.255.255.255.
Which technology enables devices in an IPv6-only network to communicate with devices in an IPv4-only network?
NAT64. NAT64 can be used on a router to translate an IPv6 address to an IPv4 address and to translate an IPv4 address to an IPv6 address. This technology enables the devices to communicate, even though they use different versions of IP.
A high school in New York (school A) is using videoconferencing technology to establish student interactions with another high school (school B) in Russia. The videoconferencing is conducted between two end devices through the internet. The network administrator of school A configures the end device with the IP address 209.165.201.10. The administrator sends a request for the IP address for the end device in school B and the response is 192.168.25.10. Neither school is using a VPN. The administrator knows immediately that this IP will not work. Why?
The IP address 192.168.25.10 is an IPv4 private address. This address will not be routed over the internet, so school A will not be able to reach school B. Because the address is a private one, it can be used freely on an internal network. As long as no two devices on the internal network are assigned the same private IP, there is no IP conflict issue. Devices that are assigned a private IP will need to use NAT in order to communicate over the internet.
Which three statements describe a DHCP Discover message? (Choose three.)
The message comes from a client seeking an IP address. When a host configured to use DHCP powers up on a network it sends a DHCPDISCOVER message. FF-FF-FF-FF-FF-FF is the L2 broadcast address. A DHCP server replies with a unicast DHCPOFFER message back to the host.
Which three IP addresses are private ? (Choose three.)
The private IP addresses are within these three ranges:10.0.0.0 - 10.255.255.255172.16.0.0 - 172.31.255.255192.168.0.0 - 192.168.255.255
What is the purpose of the subnet mask in conjunction with an IP address?
to determine the subnet to which the host belongs
What is one reason for subnetting an IP network?
to reduce the scope of broadcast flooding
What was the reason for the creation and implementation of IPv6?
to relieve IPv4 address depletion
Which network migration technique encapsulates IPv6 packets inside IPv4 packets to carry them over IPv4 network infrastructures?
tunneling. The tunneling migration technique encapsulates an IPv6 packet inside an IPv4 packet. Encapsulation assembles a message and adds information to each layer in order to transmit the data over the network. Translation is a migration technique that allows IPv6-enabled devices to communicate with IPv4-enabled devices using a translation technique similar to NAT for IPv4. The dual-stack migration technique allows IPv4 and IPv6 protocol stacks to coexist on the same network simultaneously.
What are two methods that can be used to shorten the IPv6 address notation? (Choose two.)
use of a double colon (::) to represent a string of all zero hextets. omit all leading zeros from all hextets in the address. To help reduce the notation of IPv6 addresses a double colon (::) can replace any single, contiguous string of one or more 16-bit hextets consisting of all zeros. In addition, all leading zeros can be omitted from any hextet in the notation.
