Please Answer the following questions one by one correctly and i will give you a
ID: 640974 • Letter: P
Question
Please Answer the following questions one by one correctly and i will give you all the points possible.
Chapter 21
3) What is the primary purpose of the address resolution protocol (ARP)?
6) What is the difference between Dynamic and static address resolution?
7) What information is generally stored in an ARP cache?
8) Describe the purpose of proxy ARP.
11) Describe the differences between hardware and IP addressing.
Week 7 Homework questions
Chapter 22
4) List and describe the three fields of an ICMP header that are common to all ICMP messages.
6) List the eight query and six variation messages currently used with ICMP
8) What are the two subcategories of ICMP query messages?
Chapter 23
2) What is the primary function of port addresses?
5) List the advantages of UDP over TCP
6) List and describe the fields that comprise a UDP header.
Explanation / Answer
Chapter 21
3. Address Resolution Protocol (ARP) is a low-level network protocol for translating network layer addresses into link layer addresses.
ARP lies between layers 2 and 3 of the OSI model, although ARP was not included in the OSI framework and allows computers to introduce each other across a network prior to communication.
Because protocols are basic network communication units, address resolution is dependent on protocols such as ARP, which is the only reliable method of handling required tasks.
6. Basically it is how they are given to you. For a static IP you call your internet provider and ask for one. You enter it into your TCP/IP properties and that is the IP address your system will have. Since it is fixed it is slightly easier to track you down.
A dynamic one is assigned by a DHCP (Dynamic Host Configuration Protocol) when your computer connects to your ISP. Your computer picks it up and uses it automatically. At a certain period (say once a month) the "lease" on your IP address will expire and your ISP will give you a new one.
This has 2 advantages. Unused IP addresses are freed for the ISP provider to use for new customers. Tells the ISP system your computer is still on the network.
7. ARP cache is a table that contains the IP addresses and their corresponding MAC addresses for computers/ systems within a network.
8. Proxy ARP is a technique by which a device on a given network answers the ARP queries for a network address that is not on that network. The ARP Proxy is aware of the location of the traffic's destination, and offers its own MAC address as (ostensibly final) destination. The "captured" traffic is then typically routed by the Proxy to the intended destination via another interface or via a tunnel.
11.
Chapter 22
4.
The structure of an ICMP message can be generally thought of as having a common part and a unique part. The common part consists of three fields that have the same size and same meaning in all ICMP messages (though the values in the fields aren't the same for each ICMP message type, of course). The unique part contains fields that are specific to each type of message.
Interestingly, the common message format is basically the same for ICMPv4 and ICMPv6.
ICMP Common Message Format