6.1-1. Link-layer services. Which of the following services may be implemented in a link-layer protocol? Select one or more statements.多项选择题
A
Reliable data transfer between directly connected nodes.
B
Coordinated access to a shared physical medium.
C
Multiplexing down from / multiplexing up to a network-layer protocol.
D
Lookup and forwarding on the basis of an IP destination address.
E
Bit-level error detection and correction.
F
Flow control between directly connected nodes.
G
End-end path determination through multiple IP routers.
H
TLS security (including authentication) between directly connected nodes.
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Link Layer (and network layer) addressing and forwarding Host B is sending a datagram to Host A. Assume that Host B's ARP table is empty (ARP query is required). Please fill in the following table with IP or MAC addresses. (Write the ip addresses in the format 192.168.1.1 and Mac addresses in the same format as the image 33-33-33-33-33-33) source IP address source MAC address destination IP address destination MAC address Host B sends ARP query [Fill in the blank] [Fill in the blank] [Fill in the blank] [Fill in the blank] Host B sends datagram [Fill in the blank] [Fill in the blank] [Fill in the blank] [Fill in the blank] B) Host B is now sending an IP datagram to Host C. Assume all ARP tables in all hosts are up to date (no ARP query is required). Please fill in the following table with IP or MAC addresses. source IP address source MAC address destination IP address destination MAC address Host B sends datagram [Fill in the blank] [Fill in the blank] [Fill in the blank] [Fill in the blank] Host C receives datagram [Fill in the blank] [Fill in the blank] [Fill in the blank] [Fill in the blank]
Link Layer (and network layer) addressing and forwarding Consider the figure below. The IP and MAC addresses are shown for nodes A, B, C and D, as well as for the router's interfaces. Consider an IP datagram being sent from node B to node D. Give the source and destination Ethernet addresses, as well as the source and destination addresses of the IP datagram encapsulated within the Ethernet frame at points (3),(4), and (5) in the figure above. Point (3) Point (3) Source MAC address [ Select ] CF-E2-45-68-B9-F2 B9-1F-61-D8-63-EF 8C-B1-62-18-C4-10 A6-02-A3-83-BA-91 18-61-4F-33-54-1D 57-44-52-67-90-69 E1-BB-A7-7B-E9-C7 Dest MAC address [ Select ] A6-02-A3-83-BA-91 E1-BB-A7-7B-E9-C7 8C-B1-62-18-C4-10 B9-1F-61-D8-63-EF 18-61-4F-33-54-1D 57-44-52-67-90-69 CF-E2-45-68-B9-F2 Source IP address [ Select ] 128.119.48.9 128.119.226.60 128.119.226.134 128.119.48.213 128.119.237.176 128.119.237.101 128.119.237.137 Dest IP address [ Select ] 128.119.237.101 128.119.48.213 128.119.237.176 128.119.48.9 128.119.226.60 128.119.226.134 128.119.237.137 Point (4) Point (4) Source MAC address [ Select ] 8C-B1-62-18-C4-10 B9-1F-61-D8-63-EF CF-E2-45-68-B9-F2 57-44-52-67-90-69 18-61-4F-33-54-1D E1-BB-A7-7B-E9-C7 A6-02-A3-83-BA-91 Dest MAC address [ Select ] CF-E2-45-68-B9-F2 A6-02-A3-83-BA-91 57-44-52-67-90-69 E1-BB-A7-7B-E9-C7 8C-B1-62-18-C4-10 B9-1F-61-D8-63-EF 18-61-4F-33-54-1D Source IP address [ Select ] 128.119.226.60 128.119.48.9 128.119.226.134 128.119.237.176 128.119.48.213 128.119.237.137 128.119.237.101 Dest IP address [ Select ] 128.119.237.176 128.119.237.137 128.119.48.213 128.119.226.134 128.119.226.60 128.119.237.101 128.119.48.9 Point (5) Point (5) Source MAC address [ Select ] 18-61-4F-33-54-1D B9-1F-61-D8-63-EF 57-44-52-67-90-69 CF-E2-45-68-B9-F2 A6-02-A3-83-BA-91 E1-BB-A7-7B-E9-C7 8C-B1-62-18-C4-10 Dest MAC address [ Select ] CF-E2-45-68-B9-F2 57-44-52-67-90-69 18-61-4F-33-54-1D 8C-B1-62-18-C4-10 A6-02-A3-83-BA-91 B9-1F-61-D8-63-EF E1-BB-A7-7B-E9-C7 Source IP address [ Select ] 128.119.237.101 128.119.237.137 128.119.48.9 128.119.226.60 128.119.48.213 128.119.226.134 128.119.237.176 Dest IP address [ Select ] 128.119.48.213 128.119.237.101 128.119.226.60 128.119.237.137 128.119.48.9 128.119.226.134 128.119.237.176
Switches operate at the ... layer of OSI.
Which two sublayers make up the Data Link layer in IEEE 802 networks?
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