IPv4 Addresses

Question 1

Compare DoD to OSI layer

Answer 1

7. Application 6. Presentation 5. Session = Process and Application 4. Transport 3. Network = Host-to-Host = Internet 2. Data Link 1. Physical = Network Access

Question 2

What are the reserved IPv4 addresses?

Answer 2

Undefined - used for default gateway : 0.0.0.0 Broadcast - 255.255.255.255 Loopback - your computer before datalink: 127.0.0.1

Question 3

What is ICMP?

Answer 3

Internet control message protocol Layer 3 protocol managing message delivery Indicates network congestion Message delivery failure Discarded messages

Question 4

What is IGMP?

Answer 4

Internet group management protocol Layer 3 protocol managing multicast message delivery Used for teleconference & video conference Used by routers to exchange network info Used by network nodes to join or leave multicast groups

Question 5

What’s ARP?

Answer 5

Broadcast layer 2 protocol working w/ IPv4 Learns & maintains mapping of IP to MAC addresses on LAN Mappings form frame based on IP address in packet Mappings may be dynamic (learned auto) or static (human provided) Use arp -a to view arp table

Question 6

Describe the IPv4 class addresses

Answer 6

Refer to the chart