ITNW 1425: Module 22
Which statement describes a characteristic of the network layer in the OSI model? It manages the data transport between the processes running on each host. In the encapsulation process, it adds source and destination port numbers to the IP header. When a packet arrives at the destination host, its IP header is checked by the network layer to determine where the packet has to be routed. Its protocols specify the packet structure and processing used to carry the data from one host to another.
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? ARP DNS NAT SMB DHCP HTTP
NAT
Which layer of the OSI model is responsible for the logical addressing of packets? data link network session transport
Network
Which field includes common values such as ICMP (1), TCP (6), and UDP (17)? Header Checksum Time to Live Protocol Differentiated Services (DS)
Protocol
What information is added during encapsulation at OSI Layer 3? source and destination MAC source and destination application protocol source and destination port number source and destination IP address
Source and destination IP address
Which is true of the IPv6 packet header? The Hop Limit field replaces the IPv4 Time to Live field. The Source and Destination IPv6 addresses change while travelling from source to destination. The Time to Live field replaces the DiffServ field. The Version field identifies the next header.
The Hop Limit field replaces the IPv4 Time to Live field.
How does the network layer use the MTU value? The network layer depends on the higher level layers to determine the MTU. The network layer depends on the data link layer to set the MTU, and adjusts the speed of transmission to accommodate it. The MTU is passed to the network layer by the data link layer. To increase speed of delivery, the network layer ignores the MTU.
The MTU is passed to the network layer by the data link layer.
Which characteristic of the network layer in the OSI model allows carrying packets for multiple types of communications among many hosts? the de-encapsulation of headers from lower layers the selection of paths for and direct packets toward the destination the ability to operate without regard to the data that is carried in each packet the ability to manage the data transport between processes running on hosts
The ability to operate without regard to the data that is carried in each packet
Which statement is correct about IPv4 packet header fields? The source and destination IPv4 addresses remain the same while travelling from source to destination. The Time to Live field is used to determine the priority of each packet. The Total Length and Header Checksum fields are used to reorder a fragmented packet. The Version field identifies the next level protocol.
The source and destination IPv4 addresses remain the same while travelling from source to destination.
Which value, that is contained in an IPv4 header field, is decremented by each router that receives a packet? Differentiated Services Fragment Offset Header Length Time-to-Live
Time-to-Live
Which OSI layer sends segments to be encapsulated in an IPv4 or IPv6 packet? data link layer network layer transport layer session layer
Transport layer
Why is IPv6 designed to replace IPv4? because most computers have a 64-bit processor because the IPv4 address space will soon be depleted to allow computers to address more memory to address compatibility issues with mobile devices
Because the IPv4 address space will soon be depleted
Which delivery method does not guarantee that the packet will be delivered fully without errors? connectionless best effort media independent
Best effort
Which layer is responsible for taking an IP packet and preparing it for transmission over the communications medium? physical layer network layer data link layer transport layer
Data link layer
What is the order of encapsulation for the protocol data units passing from the user application down the stack? bits, segments, packets, frames, data data, segments, packets, frames, bits segments, data, packets, frames, bits segments, packets, frames, bits, data
Data, segments, packets, frames, bits
What are the two most commonly referenced fields in an IPv4 packet header that indicate where the packet is coming from and where it is going? (Choose two.) destination IP address protocol Time to Live source IP address Differentiated Services (DS)
Destination IP address, Source IP address
What process involves placing one PDU inside of another PDU? encapsulation encoding segmentation flow control
Encapsulation
What is the term for splitting up an IP packet when forwarding it from one medium to another medium with a smaller MTU? encapsulation fragmentation segmentation serialization
Fragmentation
Which field is used to detect corruption in the IPv4 header? Header Checksum Time to Live Protocol Differentiated Services (DS)
Header Checksum
Which three options are major issues associated with IPv4? (Choose three.) IP address depletion increased network complexity and Internet routing table expansion always on connections lack of end-to-end connectivity global and political boundaries too many IPv4 addresses available
IP address depletion, Increased network complexity and Internet routing table expansion, Lack of end-to-end connectivity
Which statement accurately describes a characteristic of IPv4? All IPv4 addresses are assignable to hosts. IPv4 has a 32-bit address space. An IPv4 header has fewer fields than an IPv6 header has. IPv4 natively supports IPsec.
IPv4 has a 32-bit address space.
Which two options are improvements provided by IPv6 as compared to IPv4? (Choose two.) header supports additional fields for complex packets increased the IP address space standardizes the use of NAT supports class-based networks uses a simpler header to provide improved packet handling
Increased the IP address space, Uses a simpler header to provide improved packet handling
Which is true of the IPv6 header? it consists of 20 octets. it consists of 40 octets. it contains 8 header fields. it contains 12 header fields.
It consists of 40 octets, It contains 8 header fields.
