6.4-10 Network- and Link-layer addressing: an end-to-end-scenario (3a). Consider the network shown below. The IP and MAC addresses are shown for hosts A, B, C and D, as well as for the router's interfaces. Consider an IP datagram being sent from node C to node A (note: from right to left). Match the source/destination network- or link-layer address at the location (1) by choosing a value from the pulldown list. 77-34-F1-EF-14-72 128.119.97.18 (6) 68-01-BC-58-AF-24 128.119.50.107 (5) What is the source IP address of the datagram at point (1)? CC-A5 128.1 What is the source MAC address on the frame at point (1)? What is the destination MAC address on the frame at point (1)? What is the destination IP address of the datagram at point (1)? [Choose ] The MAC address of the switch immediately left of location (1). 128.119.240.52 72-9E-4A-31-9C-42 CC-A5-81-0B-AE-33 128.119.97.194 128.119.240.15 128.119.97.18 49-FA-B0-3C-E2-7C 128.119.50.60 4C-9D-AA-74-D6-1F 77-34-F1-EF-14-72 [Choose ] [Choose] [Choose ] [Choose ] 4C-90-AA-74-D6-1F 128.119.240.52 >

6.4-10 Network- and Link-layer addressing: an end-to-end-scenario (3a). Consider the network shown below. The IP and MAC addresses are shown for hosts A, B, C and D, as well as for the router's interfaces. Consider an IP datagram being sent from node C to node A (note: from right to left). Match the source/destination network- or link-layer address at the location (1) by choosing a value from the pulldown list. 77-34-F1-EF-14-72 128.119.97.18 (6) 68-01-BC-58-AF-24 128.119.50.107 (5) What is the source IP address of the datagram at point (1)? CC-A5 128.1 What is the source MAC address on the frame at point (1)? What is the destination MAC address on the frame at point (1)? What is the destination IP address of the datagram at point (1)? [Choose ] The MAC address of the switch immediately left of location (1). 128.119.240.52 72-9E-4A-31-9C-42 CC-A5-81-0B-AE-33 128.119.97.194 128.119.240.15 128.119.97.18 49-FA-B0-3C-E2-7C 128.119.50.60 4C-9D-AA-74-D6-1F 77-34-F1-EF-14-72 [Choose ] [Choose] [Choose ] [Choose ] 4C-90-AA-74-D6-1F 128.119.240.52 >

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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3.Suppose all of the interfaces in each of these three subnets are required to have the prefix 223.1.17/24. Also suppose that Subnet 1 is required to support at least 60 interfaces, Subnet 2 is to support at least 90 interfaces, and Subnet 3 is to support at least 12 interfaces. Provide three network addresses (of the form a.b.c.d/x) that satisfy these constraints ANS： 223.1.17.0/26 223.1.17.128/25 223.1.17.192/28 I'm not sure if my answer is correct, could you give me a detailed answer,I'm not sure how to compute the 223.1.17.x. this question is from: Three different subnets named Subnet 1, Subnet 2 and Subnet 3 are interconnected in a network and the interfaces related to these subnets require a prefix 223.1.17/24. Subnet 1 that supports minimum of 60 interfaces requires the network address 223.1.17.0/26. The network address required by the Subnet 2 that supports minimum of 90 interfaces is 223.1.17.128/25. Subnet 3 which supports at least 12 interfaces requires the network address…
3.Suppose all of the interfaces in each of these three subnets are required to have the prefix 223.1.17/24. Also suppose that Subnet 1 is required to support at least 60 interfaces, Subnet 2 is to support at least 90 interfaces, and Subnet 3 is to support at least 12 interfaces. Provide three network addresses (of the form a.b.c.d/x) that satisfy these constraints ANS： 223.1.17.0/26 223.1.17.128/25 223.1.17.192/28 I'm not sure if my answer is correct, could you give me a detailed answer,I'm not sure how to compute /x
6.4-3 Network- and Link-layer addressing: an end-to-end-scenario (1c). Consider the network shown below. The IP and MAC addresses are shown for hosts 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. Match the source/destination network- or link-layer address at the location (5)by choosing a value from the pulldown list. [Note: You can find more examples of problems similar to this here.]
Consider the following diagram: A,B,C and D are subnets, R1, R2, and R3 are routers. Default signifies theentire rest of the internet. All 4 subnets each contain the same number of hosts.Consider the following routing table at R3: CIDR Mask Link 0.0.0.0/0 L4 128.4.6.0/24 L3 128.4.8.0/24 L5 1. If 128.4.6.0 is in A, what is the routing table at R1? 2. The ISP that owns all these networks is short on IP addresses, so theyuse a NAT router for R2. How many public IP addresses will C andD use together assuming they use as many private 10.X IP addresses asthey can? How many total public IP addresses will be used by the entirenetwork? Why doesn’t the ISP care about how many private IP addressesare used? 3. Fix R3’s routing table now that we are using NAT: 4. A node in C is given the IP address 10.0.0.1 and only sends and receivespackets on port 1234. A packet destined for this node reaches R2 witha source of (IP=128.4.6.6, Port=3000) and destination of (IP=128.4.8.0,Port=10000).…
14.3. What is the header overhead in the IP protocol? 14.5. Because of fragmentation, an IP datagram can arrive in several pieces, not necessarily in the correct order. The IP entity at the receiving end system must accumulate these fragments until the original datagram is reconstituted. Consider that the IP entity creates a buffer for assembling the data field in the original datagram. As assembly proceeds, the buffer will contain blocks of data and “holes” between the data blocks. Describe an algorithm for reassembly based on this concept. For the algorithm in part (a), it is necessary to keep track of the holes. Describe a simple mechanism for doing this. 14.13. Provide the following parameter values for each of the network classes A, B, and C. Be sure to consider any special or reserved addresses in your calculations. Number of bits in network portion of address Number of bits in host portion of address Number of distinct networks allowed Number of distinct hosts per network…
DATA COMMUNICATION Consider a subnet with prefix 223.1.24.0/24. How to create three subnets from this subnet, so that subnet 1 can support at least 50 interfaces, subnet 2 can support at least 12 interfaces, and subnet 3 can support at least 100 interfaces. Provide three network addresses (of the form a.b.c.d/x) that satisfy these constraints.
Consider an Infrastructure BSS with an Access Point and two Mobile Stations, and let’s use AP, M1, and M2 to denote their MAC addresses. Both M1 and M2 are associated with the AP. Suppose M1 wants to send a data frame to M2. When this data frame is relayed by the AP, explain how the AP shall update the four address fields of the data frame.
P5. Consider a datagram network using 32-bit host addresses. Suppose a router has four links, numbered 0 through 3, and packets are to be forwarded to the link interfaces as follows: (refer to first image) a. Provide a forwarding table that has five entries, uses longest prefix matching, and forwards packets to the correct link interfaces. b. Describe how your forwarding table determines the appropriate link interface for datagrams with destination addresses: (refer to second image)
b) Consider a scenario where fragmentation may take place in packet transfer. Discuss how such fragmentation may be reassembled at the destination. Now consider in such scenario, a datagram is fragmented into five fragments. The first four fragments arrive, but the last one is delayed. Eventually, the timer goes off and the four fragments in the receiver’s memory are discarded. A little later, the last fragment arrives. What should be done with it?
7.1 In IEEE 802.11, open system authentication is accomplished via a simple two-way communication. The client requests authentication, which includes the station ID, which is provided by the server (typically the MAC address). A successful or unsuccessful authentication response from the AP/router is received in response to the previous request from the client. For instance, if the client's MAC address has been expressly omitted from the AP/router setup, a failure may occur.a. What are the advantages of using this kind of authentication scheme?b. What are the security flaws in this authentication method and how may they be mitigated?
Suppose 198.53.202.0 is a network address and we want 4 subnets. Find the following: - Number of bits required for subnetting - Subnet mask - Range of address in each subnet - Broadcast address for each subnet
Problem 1- IP Fragmentation Consider sending a 3500-byte datagram into a link that has an MTU of 1000 bytes. How many fragments are generated? What are their characteristics (i.e. what are the flags and offset values for each and start and ending of data bytes of each fragment (Assume that the DF flag was not set : )Solution: Assume that no optional fields of the IP header are in use (i.e. IP header is 20 bytes)