qr code generator c# tutorial ARP resolves layer 3 IP addresses to layer 2 MAC addresses: The source sends in Objective-C

Paint QR Code in Objective-C ARP resolves layer 3 IP addresses to layer 2 MAC addresses: The source sends

ARP resolves layer 3 IP addresses to layer 2 MAC addresses: The source sends
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out a layer 2 local broadcast with the encapsulated ARP packet to discover the layer 3 address of a destination on the same segment or broadcast domain
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If a router sits between the source and destination, the IP addresses are the
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actual source and destination, but two Ethernet frames are used The first frame has a source MAC address of the source and a destination MAC address of the router; the second frame has a source MAC address of the router and a destination MAC address of the actual destination
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ICMP is used to test layer 3 connectivity between network components
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ipconfig allows you to view a Windows PC TCP/IP configuration ping and tracert allow you to test layer 3 connectivity on a Windows
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arp allows you to view, modify, and delete ARP table entries on a Windows
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6: TCP/IP and the Internet Layer
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The following Self Test questions will help you measure your understanding of the material presented in this chapter Read all the choices carefully, as there may be more than one correct answer Choose all correct answers for each question
TCP/IP Protocol Stack
1 How many layers does the TCP/IP protocol stack have A B C D A B C D A B C D A B C D A B C D 3 4 5 7 The Internet layer corresponds to layer 3 of the OSI Reference Model The IP protocol provides for connectionless delivery of datagrams The IP protocol provides for best effort delivery, with data recovery capabilities The source and destination address in an IP header totals 64 bits 8 16 20 24 A B C None of the above A B C None of the above
2 Which of the following is not true concerning the IP protocol and the TCP/IP protocol stack
3 A Class A address has __________ host bits
4 191753924 is a Class __________ address
5 17216240256 is a Class __________ address
Self Test
6 Which of the following is a private IP address A B C D 1018928966 172321819 19216911 None of the above
TCP/IP Internet Protocols
7 You are testing connectivity with the ping command and getting a request timeout or destination unreachable message in reply At what layer of the OSI Reference Model does this indicate a problem A B C D Transport or lower Data link or lower Network or lower Application or lower
8 Examine Figure 6-3 PC-A wants to send a packet to PC-B When PC-A ARPs for the correct MAC address, what will the response be in the ARP reply A B C D 00000CCC1111 00000CCC2222 00000CCC3333 00000CCC4444
TCP/IP Tools for Windows PCs
9 You execute ping 127001 on your Windows PC and you get echo replies to the ping What does this behavior indicate A B C D You have connectivity to other layer 3 devices You have connectivity to other hosts on the same segment or broadcast domain You have correctly installed TCP/IP on your PC You have correctly configured your DNS and default gateway settings on your PC
10 You execute the Windows ping command The first echo request times out, but the last three are successful What would typically cause this problem A B C D DHCP is occurring ARP is occurring The routers are running a routing protocol to find a destination There is an application layer problem
6: TCP/IP and the Internet Layer
SELF TEST ANSWERS
TCP/IP Protocol Stack
1 B The TCP/IP protocol stack has four layers: network access, internet, transport, and application A, C, and D are incorrect 2 C The IP protocol does not provide for data recovery capabilities if this is needed, TCP is used A, B, and D are true and are therefore incorrect answers 3 D Class A addresses have 24 host bits and 8 networking bits A is true for Class C networks B is true for Class B networks C can only be true for subnetted Class A and B networks 4 B 191753924 is a Class B network Class B networks range from 128 to 191 A addresses range from 1 to 126 C addresses range from 192 to 223 Since there is an answer, D is incorrect 5 D It s impossible to represent 256 in a byte value (see the fourth octet) the values range from 0 to 255 in a byte value A, B, and C are incorrect 6 D None of the answers are correct A is incorrect because 289 cannot be represented in a byte (the maximum number is 256) B is incorrect because the reserved range of Class B addresses are 1721600 to 17231255255 C is incorrect because the reserved range of Class C addresses are 19216800 to 192168255255
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