Networking Devices and Initial Configuration 4-6
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.
Which is a valid default gateway address for a host configured with IP address 10.25.1.110 and a subnet mask of 255.255.255.192?
10.25.1.65 To be valid, the default gateway address must be on the same subnet as the host. A host with an IP address 10.25.1.110 and a subnet mask of 255.255.255.192 is a member of the 10.25.1.64 subnet. This subnet has a usable host address range of 10.25.1.65 through 10.25.1.126. Any address within that range, with the exception of the address configured already on the host and the broadcast address of the subnet, is valid for a default gateway.
How many unique addresses are available for assignment to hosts in the network of 10.100.16.0 with subnet mask 255.255.252.0?
1022
How many octets exist in an IPv4 address?
4 Each octet holds 8 bits and an IPv4 address contains 32 bits. Therefore, an IPv4 address contains four octets.
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.
For what purpose are IPv4 addresses utilized?
An IPv4 address is used to uniquely identify a device on an IP network. A MAC address is burned into a NIC to uniquely identify a device. A port number is used to uniquely identify the application that requested information. The subnet mask identifies how many hosts can be on a network and the network number. There is not really any parameter that identifies the number of free IP networks.
Which full range of decimal values are valid in one octet of an IPv4 address?
An octet can contain 8 bits. Each bit can be a 1 or a 0 because the binary system is used. To determine the number of values that can be represented by a specific number of bits, use the formula 2x where the x represents a specific number of bits. For 8 bits, 28 = 256. The numbers 0 through 255 are the valid values. Another way of looking at it is that the lowest value would be 8 0's or 00000000 (decimal 0). The highest value is 8 1's or 11111111 (decimal 255).
Match the components in the notation 100Base-T to the specification.
BASE- Baseband transmission T- Twisted-pair cable 100- Speed in Mbps
Which statement accurately describes a characteristic of IPv4?
IPv4 has a 32-bit address space.
Which two characteristics describe Ethernet technology? (Choose two.)
It is supported by IEEE 802.3 standards. It uses unique MAC addresses to ensure that data is sent to the appropriate destination.
What will a host on an Ethernet network do if it receives a frame with a unicast destination MAC address that does not match its own MAC address?
It will discard the frame.
Which statement describes a characteristic of the network layer in the OSI model?
Its protocols specify the packet structure and processing used to carry the data from one host to another.
Which technology provides a solution to IPv4 address depletion by allowing multiple devices to share one public IP address?
NAT
What is the order of encapsulation for the protocol data units passing from the user application down the stack?
The correct order of encapsulation of protocol data units down the protocol stack is as follows: data segments packets frames bits
How does the network layer use the MTU value?
The data link layer indicates to the network layer the MTU for the medium that is being used. The network layer uses that information to determine how large the packet can be when it is forwarded. When packets are received on one medium and forwarded on a medium with a smaller MTU, the network layer device can fragment the packet to accommodate the smaller size.
Which three fields are found in an 802.3 Ethernet frame? (Choose three.)
The fields of an Ethernet frame are the preamble, destination and source address, length, data, and FCS.
What happens to runt frames received by a Cisco Ethernet switch?
The frame is dropped.
Which characteristic of the network layer in the OSI model allows carrying packets for multiple types of communications among many hosts?
The function of the network layer protocols specifies the packet structure and processing used to carry the data from one host to another host. The actual communication data is encapsulated in the network layer PDU. The feature of its operation without regard to the data carried in each packet allows the network layer to carry packets for multiple types of communications.
Which layer of the OSI model is responsible for the logical addressing of packets?
The network layer is the layer that consists of packets containing logical (IP) addressing.
Which statement describes IPv4 addressing?
The network portion of a destination IP address is obtained by performing an AND operation between a host IP address and a subnet mask.
Which Ethernet sublayer is used to control network access using CSMA/CD?
The two Ethernet sublayers are LLC and MAC. LLC manages communications with the upper layers. MAC is the lower sublayer and is responsible for encapsulating the data and getting it onto the network media. In order to get the data onto the media, a specific process must be used. Ethernet uses the CSMA/CD process.
What is obtained when ANDing the address 192.168.65.3/18 with its subnet mask?
The value of the IP address 192.168.65.3 in binary is 11000000.10101000.01001110.00000011. The value of the subnet mask in binary is 11111111.11111111.11000000.00000000. When ANDing the two, the result is 11000000.10101000.01000000.00000000, which in turn converts into 192.168.64.0.
What do devices on the same IPv4 subnet have in common?
They all use the same default gateway.
Which value, that is contained in an IPv4 header field, is decremented by each router that receives a packet?
Time-to-Live
Why is IPv6 designed to replace IPv4?
because the IPv4 address space will soon be depleted
What is the length restriction of the data field in an Ethernet frame?
between 46 to 1500 bytes
What important information is examined in the Ethernet frame header by a Layer 2 device in order to forward the data onward?
destination MAC address
What process involves placing one PDU inside of another PDU?
encapsulation When a message is placed inside of another message, this is known as encapsulation. On networks, encapsulation takes place when one protocol data unit is carried inside of the data field of the next lower protocol data unit.
What is indicated by the 100 in the 100BASE-T standard?
megabits per second
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 information is added during encapsulation at OSI Layer 3?
source and destination IP address IP is a Layer 3 protocol. Layer 3 devices can open the Layer 3 header to inspect the Layer 3 header which contains IP-related information including the source and destination IP addresses.
When IPv4 addressing is manually configured on a web server, which property of the IPv4 configuration identifies the network and host portion for an IPv4 address?
subnet mask There are several components that need to be entered when configuring IPv4 for an end device: IPv4 address - uniquely identifies an end device on the network Subnet mask - determines the network address portion and host portion for an IPv4 address. Default gateway - the IP address of the router interface used for communicating with hosts in another network. DNS server address - the IP address of the Domain Name System (DNS) server. DHCP server address (if DHCP is used) is not configured manually on end devices. It will be provided by a DHCP server when an end device requests an IP address.
What is encapsulated into the data field of an Ethernet frame?
the Layer 3 PDU
What addressing information is recorded by a switch to build its MAC address table?
the source Layer 2 address of incoming frames
