Networking Devices: Checkpoint Exam 4-6 Flashcards
What are the six parts of the ethernet frame fields?
Preamble and SFD,
Destination MAC Address,
Source MAC Address,
Type / Length,
Data, &
Frame Check Sequence
Which part of an Ethernet Frame describes the higher-layer protocol that is encapsulated?
EtherType
What are the two sub layers of the data link layer?
Logical Link Control (LLC) and the Media Access Control (MAC)
LLC Sublayer
Communicates between the networking software at the upper layers and the device hardware at the lower layers.
MAC Sublayer
Implemented in hardware and is responsible for data encapsulation and media access control by checking for errors in received bits. It provides data link layer addressing and is integrated with various physical layer technologies.
What is a function of the MAC sublayer?
Controls access to the media, checks for errors in received bits, & uses CSMA/CD or CSMA/CA to support Ethernet technology
Broadcast MAC Address
FF-FF-FF-FF-FF-FF, flooded out all Ethernet switch ports except the incoming port, and not forwarded by a router
Multicast MAC Address
01-00-5E = IPv4 or 33-33 = IPv6, flooded out all Ethernet switch ports except the incoming port (with config exeptions), and not forwarded by a router (with config exeptions
What is encapsulated into the data field of an Ethernet frame?
The Layer 3 PDU
What is the length restriction of the data field in an Ethernet frame?
between 46 to 1500 bytes
Which Ethernet sublayer is used to control network access using CSMA/CD?
MAC
Which three fields are found in an 802.3 Ethernet frame?
source physical address,
destination physical address, and
frame check sequence
What are the network layer protocols four basic operations:
Addressing end devices,
Encapsulation,
Routing, and
De-encapsulation
Which OSI layer is responsible for taking an IP packet and preparing it for transmission over the communications medium?
data link layer receives IP packets from the network layer and encapsulates them for transmission over the medium.
What are the characteristics of IP:
Connectionless = no connection before,
Best Effort = inherently unreliable, &
Media Independent = i.e., copper, fiber-optic, or wireless
What are all the IPv4 headers?
Version,
Differentiated Services,
Time to Live,
Protocol,
Header Checksum,
Source IPv4 Address, and
Destination IPv4 Address
What are the three major issues of IPv4?
Depletion, No end-to-end connectivity, and network complexity
What are the three improvments of IPv6?
Increased address space, Improved packet handling, and Eliminates the need for NAT
What are all the IPv6 headers?
Version,
Traffic Class,
Flow Label,
Payload Length,
Next Header,
Hop Limit,
Source IPv6 Address, and
Destination IPv6 Address
Which two options are improvements provided by IPv6 as compared to IPv4?
Uses a simpler header to provide improved packet handling and increased the IP address space
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.
Explanation: The IPv6 header is a fixed length of 40 octets and contains 8 header fields.
Which statement accurately describes a characteristic of IPv4?
IPv4 has a 32-bit address space
Which characteristic of the network layer in the OSI model allows carrying packets for multiple types of communications among many hosts?
The ability to operate without regard to the data that is carried in each packet.
Explanation: 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.
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
