Securing the Everywhere Perimeter Iot, BYOD, and Cloud Have Fragmented the Traditional Network Perimeter
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LAB MANUAL for Computer Network
LAB MANUAL for Computer Network CSE-310 F Computer Network Lab L T P - - 3 Class Work : 25 Marks Exam : 25 MARKS Total : 50 Marks This course provides students with hands on training regarding the design, troubleshooting, modeling and evaluation of computer networks. In this course, students are going to experiment in a real test-bed networking environment, and learn about network design and troubleshooting topics and tools such as: network addressing, Address Resolution Protocol (ARP), basic troubleshooting tools (e.g. ping, ICMP), IP routing (e,g, RIP), route discovery (e.g. traceroute), TCP and UDP, IP fragmentation and many others. Student will also be introduced to the network modeling and simulation, and they will have the opportunity to build some simple networking models using the tool and perform simulations that will help them evaluate their design approaches and expected network performance. S.No Experiment 1 Study of different types of Network cables and Practically implement the cross-wired cable and straight through cable using clamping tool. 2 Study of Network Devices in Detail. 3 Study of network IP. 4 Connect the computers in Local Area Network. 5 Study of basic network command and Network configuration commands. 6 Configure a Network topology using packet tracer software. 7 Configure a Network topology using packet tracer software. 8 Configure a Network using Distance Vector Routing protocol. 9 Configure Network using Link State Vector Routing protocol. Hardware and Software Requirement Hardware Requirement RJ-45 connector, Climping Tool, Twisted pair Cable Software Requirement Command Prompt And Packet Tracer. EXPERIMENT-1 Aim: Study of different types of Network cables and Practically implement the cross-wired cable and straight through cable using clamping tool. -
Understanding CIDR Notation Used for IP Address Display on 2500 Series® Processors
Application Note 2500 Series® Programmable Automation Control System Understanding CIDR Notation Used for IP Address Display on 2500 Series® Processors Newer CTI products featuring Ethernet ports, such as the 2500 Series® processor, the 2500P-ECC1, and 2500P-ACP1, display the IP address of the product on the front panel multi-segment display. This information has proven very useful to most customers, facilitating the connection of browsers to obtain diagnostic data and providing visual confirmation of the operating IP address. Beginning with Version 8.02 of the 2500 Series® processor firmware, we’ve added the capability to display the subnet mask in CIDR notation. This gives users more complete information about the IP address setting to allow them to easily get connected. This application note shows how to interpret the CIDR notation displayed on the front of the processor. What is CIDR Notation? CIDR notation (Classless Inter-Domain Routing) is an alternate method of representing a subnet mask. It is simply a count of the number of network bits (bits that are set to 1) in the subnet mask. Subnet mask bits are explained in a following section. The CIDR number is typically preceded by a slash “/” and follows the IP address. For example, an IP address of 131.10.55.70 with a subnet mask of 255.0.0.0 (which has 8 network bits) would be represented as 131.10.55.70 /8. CIDR notation is more concise method for designating the subnet mask. Compared to Dotted Decimal notation, which represents the mask as four values, each representing the decimal value of an octet of the mask, the CIDR format represents the mask as a single value. -
LAN Topologies
0390.book Page 13 Wednesday, November 14, 2001 3:28 PM C H A P T E R 2 LAN Topologies The application in use, such as multimedia, database updates, e-mail, or file and print sharing, generally determines the type of data transmission. LAN transmissions fit into one of three categories: • Unicast • Multicast • Broadcast Unicast With unicast transmissions, a single packet is sent from the source to a destination on a network. The source-node addresses the packet by using the network address of the destination node. The packet is then forwarded to the destination network and the network passes the packet to its final destination. Figure 2-1 is an example of a unicast network. Figure 2-1 Unicast Network Server Client Client Client 0390.book Page 14 Wednesday, November 14, 2001 3:28 PM 14 Chapter 2: LAN Topologies Multicast With a multicast transmission, a single data packet is copied and forwarded to a specific subset of nodes on the network. The source node addresses the packet by using a multicast address. For example, the TCP/IP suite uses 224.0.0.0 to 239.255.255.255. The packet is then sent to the network, which makes copies of the packet and sends a copy to each segment with a node that is part of the multicast address. Figure 2-2 is an example of a multicast network. Figure 2-2 Multicast Network Server Client Client Client Broadcast Broadcasts are found in LAN environments. Broadcasts do not traverse a WAN unless the Layer 3 edge-routing device is configured with a helper address (or the like) to direct these broadcasts to a specified network address. -
Draft NIST SP 800-125B, Secure Virtual Network Configuration for Virtual Machine
The attached DRAFT document (provided here for historical purposes) has been superseded by the following publication: Publication Number: NIST Special Publication (SP) 800-125B Title: Secure Virtual Network Configuration for Virtual Machine (VM) Protection Publication Date: 3/29/2016 • Final Publication: http://dx.doi.org/10.6028/NIST.SP.800-125B (which links to http://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-125B.pdf). • Related Information on CSRC: http://csrc.nist.gov/publications/PubsSPs.html#SP-800-125-B • Information on other NIST cybersecurity publications and programs can be found at: http://csrc.nist.gov/ The following information was posted with the attached DRAFT document: Sep. 29, 2015 SP 800-125 B DRAFT Secure Virtual Network Configuration for Virtual Machine (VM) Protection NIST requests public comments on Draft Special Publication 800-125B, Secure Virtual Network Configuration for Virtual Machine (VM) Protection. VMs constitute the primary resource to be protected in a virtualized infrastructure, since they are the compute engines on which business/mission critical applications of the enterprise are run. Further, since VMs are end-nodes of a virtual network, the configuration of virtual network forms an important element in the security of VMs and their hosted applications. The virtual network configuration areas considered for VM protection in this document are – Network Segmentation, Network Path Redundancy, Firewall Deployment Architecture and VM Traffic Monitoring. The configuration options in each of these areas are analyzed for their advantages and disadvantages and security recommendations are provided. The specific areas where comments are solicited are: • Advantages and Disadvantages of the various configuration options in the four virtual network configuration areas. -
1.2. OSI Model
1.2. OSI Model The OSI model classifies and organizes the tasks that hosts perform to prepare data for transport across the network. You should be familiar with the OSI model because it is the most widely used method for understanding and talking about network communications. However, remember that it is only a theoretical model that defines standards for programmers and network administrators, not a model of actual physical layers. Using the OSI model to discuss networking concepts has the following advantages: Provides a common language or reference point between network professionals Divides networking tasks into logical layers for easier comprehension Allows specialization of features at different levels Aids in troubleshooting Promotes standards interoperability between networks and devices Provides modularity in networking features (developers can change features without changing the entire approach) However, you must remember the following limitations of the OSI model: OSI layers are theoretical and do not actually perform real functions. Industry implementations rarely have a layer‐to‐layer correspondence with the OSI layers. Different protocols within the stack perform different functions that help send or receive the overall message. A particular protocol implementation may not represent every OSI layer (or may spread across multiple layers). To help remember the layer names of the OSI model, try the following mnemonic devices: Mnemonic Mnemonic Layer Name (Bottom to top) (Top to bottom) Layer 7 Application Away All Layer 6 Presentation Pizza People Layer 5 Session Sausage Seem Layer 4 Transport Throw To Layer 3 Network Not Need Layer 2 Data Link Do Data Layer 1 Physical Please Processing Have some fun and come up with your own mnemonic for the OSI model, but stick to just one so you don't get confused. -
Collision & Broadcast Domain a Collision Domain Is a Section of A
Computer Networking & Communication 4th Class Arranged By: Dr.Ahmed Chalak Shakir Collision & Broadcast Domain A collision domain is a section of a network where data packets can collide with one another when being sent on a shared medium or through repeaters, particularly when using early versions of Ethernet. A network collision occurs when more than one device attempts to send a packet on a network segment at the same time. A broadcast domain is a logical division of a computer network, in which all nodes can reach each other by broadcast at the data link layer. LAYER 1 - PHYSICAL LAYER Devices - Hubs, Repeaters Collision Domain: As you might have studied both these devices just forward the data as it is to all the devices that are connected to them after attenuating it (making it stronger so that it travels more distance). All the devices fall in the SAME COLLISION DOMAIN because two or more devices might send the data at the same time even when we have CSMA/CD working. So, the data can collide and nullify each other that way no one gets nothing. Broadcast Domain: These devices don't use any type of addressing schemes to help them forward the data like MAC or IP addresses. So, if a PC A sends something for PC B and there are also C,D and E PC's connected to the hub then all the devices i.e. B,C,D and E would receive the data ( Only PC B accepts it while others drop it ). This is what is being in a single BROADCAST DOMAIN. -
Memex Ethernet Networking Guide
Ethernet Network Construct In recent years, networking computers has taken on greater Ethernet importance as organizations rely on a network for Ethernet is the most popular physical layer LAN technology communication applications like electronic mail and for core in use today. Other Lan types include Token Ring, Fast business operations functions like database applications. Ethernet, Fiber Distributed Data Interface (FDDI), This tutorial helps to explain Ethernet and Fast Ethernet, Asynchronous Transfer Mode (ATM) and LocalTalk. which are two of the most popular technologies used in Ethernet is popular because it strikes a good balance networking between speed, cost and ease of installation. These strong points, combined with wide acceptance in the computer LANs marketplace and the ability to support virtually all popular Networks are collections of independent computers that network protocols, make Ethernet an ideal networking communicate with one another over a shared network technology for most computer users today. The Ethernet medium. Local area networks (LANs) are those networks standard is defined by the Institute for Electrical and usually confined to a geographic area, such as a single Electronic Engineers (IEEE) as IEEE Standard 802.3. This building or a college campus. LANs, however, are not standard defines rules for configuring an Ethernet as well as necessarily simple in design, as they may link many specifying how elements in an Ethernet network interact hundreds of computers and be used by many thousands of with one another. By adhering to the IEEE standard, users. The development of various standards for networking network equipment and network protocols will interoperate protocols and media has made possible the proliferation of efficiently. -
Broadcast Domain
Broadcast Domain A broadcast domain is a logical part of a network (a network segment) in which any network equipment can transmit data directly to other equipment or device without going through arouting device (assuming the devices share the same subnet and use the same gateway; also, they must be in the same VLAN). A more specific broadcast domain definition is the area of the computer network that consists of every single computer or network equipment that can be reached directly by sending a simple frame to the data link layer’s broadcast address. Details on Broadcast Domains While any layer 2 device is able to divide the collision domains, broadcast domains are only divided by layer 3 network devices such as routers or layer 3 switches. Frames are normally addressed to a specific destination device on the network. While all devices detect the frame transmission on the network, only the device to which the frame is addressed actually receives it. A special broadcast address consisting of all is used to send frames to all devices on the network. The VLAN (Virtual Local Area Network) technology can also create a so-called “virtual” broadcast domain. A network built with switching devices can see each network device as an independent system. These groups of independent systems can be joined into one broadcast domain, even if the computers are not physically connected to each other. This is very useful when administrating large networks where there is the need for better network management and control. How to Restrict the Broadcast Domain Since a broadcast domain is the area where broadcasts can be received, routers restrict broadcasts. -
Network Troubleshooting
SECTION I SECTION II SECTION III SECTION IV SECTION V TROUBLESHOOTING LOCAL-AREA NETWORKS Excerpts taken from: Network Troubleshooting By Othmar Kyas An Agilent Technologies Publication Section II Troubleshooting Local-Area-Networks Chapter 7 10/100/1,000 Mbit/s Ethernet 7.2 Troubleshooting in 10/100/1,000 Mbit/s Ethernet 7.2.1 Gathering Information on Symptoms and Recent Changes 7.2.2 Starting the Troubleshooting Procedure 7.2.3 Error Symptoms in Ethernet 7.2.4 Cabling Problems 7.2.5 Problems with Ethernet Interface Cards 7.2.6 Problems with Media Access Units (MAUs) 7.2.7 Problems with Repeaters and Hubs 7.2.8 Problems with Bridges 7.2.9 Problems with Routers 7.1.10 Symptoms and Causes: 10/100/1,000 MBit/s Ethernet For additional excerpts from this chapter and other Network Troubleshooting book sections, be sure to regularly visit our web site at: www.FreeTroubleshootingBook.com New chapters will be posted every 2 to 3 weeks. Be sure to visit our web site and vote for the chapters you would like to see posted! 182 10/100/1,000 MBIT/S ETHERNET 7 7.2 Troubleshooting in 10/100/1,000 Mbit/s Ethernet 7.2.1 Gathering Information on Symptoms and Recent Changes The first step in any troubleshooting process is to gather information. The more information you have about the symptoms and characteristics of a problem— including when it first occurred—the better your chances of solving the problem quickly and efficiently. Typical questions you might ask at this stage include: Do the symptoms occur regularly or intermittently? Are the symptoms related -
Cabletron Systems Ethernet Technology Guide
Cabletron Systems ETHERNET TECHNOLOGY GUIDE Notice Cabletron Systems reserves the right to make changes in specifications and other information contained in this document without prior notice. The reader should in all cases consult Cabletron Systems to determine whether any such changes have been made. The hardware, firmware, or software described in this manual is subject to change without notice. IN NO EVENT SHALL CABLETRON SYSTEMS BE LIABLE FOR ANY INCIDENTAL, INDIRECT, SPECIAL, OR CONSEQUENTIAL DAMAGES WHATSOEVER (INCLUDING BUT NOT LIMITED TO LOST PROFITS) ARISING OUT OF OR RELATED TO THIS MANUAL OR THE INFORMATION CONTAINED IN IT, EVEN IF CABLETRON SYSTEMS HAS BEEN ADVISED OF, KNOWN, OR SHOULD HAVE KNOWN, THE POSSIBILITY OF SUCH DAMAGES. Copyright 1997 by Cabletron Systems, Inc. All rights reserved. Printed in the United States of America. Order Number: 9031913-01 April 1997 Cabletron Systems, Inc. P.O. Box 5005 Rochester, NH 03866-5005 Cabletron Systems, SPECTRUM, BRIM, DNI, FNB, INA, Integrated Network Architecture, LANVIEW, LANVIEW Secure, Multi Media Access Center, and MicroMMAC are registered trademarks, and Bridge/Router Interface Modules, BRIM-A100, CXRMIM, Desktop Network Interface, Distributed LAN Monitoring, Distributed Network Server, DLM, EFDMIM, EMM-E6, EMME, EPIM, EPIM-3PS, EPIM-A, EPIM-C, EPIM-F1, EPIM-F2, EPIM-F3, EPIM-T, EPIM-T1, EPIM-X, ESXMIM, ETSMIM, ETWMIM, FDCMIM-04, FDCMIM-08, FDMMIM, FDMMIM-04, Flexible Network Bus, FOMIM, FORMIM, HubSTACK, IRBM, IRM, IRM-2, IRM-3, Media Interface Module, MIM, MMAC, MMAC-3, MMAC-3FNB, MMAC-5, MMAC-5FNB, MMAC-8, MMAC-8FNB, MMAC-M8FNB, MMAC-Plus, MRX, MRXI, MRXI-24, MultiChannel, NB20E, NB25E, NB30, NB35, NBR-220/420/620, RMIM, SecureFast Switching, SecureFast Packet Switching, SFPS, SPECTRUM Element Manager, SPECTRUM for Open Systems, TPMIM, TPMIM-22, TPMIM-T1, TPRMIM, TPRMIM-36, TPT-T, TRBMIM, TRMM-2, and TRMMIM are trademarks of Cabletron Systems, Inc. -
1. Data Link Layer (Layer 2) the Data Link Layer Provides a Means for Exchanging Data Over a Common Local Media
University of Babylon/College of Information Technology/ Information Network Dept. / First Class / Second Semester/ Subject : Network and Distributed System/ Lecture : 4 1. Data Link Layer (Layer 2) The Data Link layer provides a means for exchanging data over a common local media. The Data Link layer performs two basic services: • Allows the upper layers to access the media using techniques such as framing. Controls how data is placed onto the media and is received from the media using techniques such as media access control and error detection. The Data Link layer is responsible for the exchange of frames between nodes over the media of a physical network. It is important to understand the meaning of the words medium and media within the context of this chapter. Here, these words refer to the material that actually carries the signals representing the transmitted data. Media is the physical copper cable, optical fiber, or atmosphere through which the signals travel. In this chapter media does not refer to content programming such as audio, animation, television, and video as used when referring to digital content and multimedia. • A physical network is different from a logical network. Logical networks are defined at the Network layer by the arrangement of the hierarchical addressing scheme. Physical networks represent the interconnection of devices on a common media. Sometimes, a physical network is also referred to as a network segment. Lecturer : Ahmed M. Al-Saleh & Mouayad Najim Page 36 University of Babylon/College of Information Technology/ Information Network Dept. / First Class / Second Semester/ Subject : Network and Distributed System/ Lecture : 4 The description of a frame is a key element of each Data Link layer protocol. -
Analysis of Network Segmentation Techniques in Cloud Data Centers
Analysis of Network Segmentation Techniques in Cloud Data Centers Ramaswamy Chandramouli Computer Security Division, Information Technology Laboratory National Institute of Standards & Technology 100 Bureau Drive, Gaithersburg, MD, USA [email protected] Abstract – Cloud Data centers are predominantly made up of Tier. Hence, a common architecture for applications is a 3- Virtualized hosts. The networking infrastructure in a cloud tier architecture consisting of Web, Application and Database (virtualized) data center, therefore, consists of the combination tiers providing respectively the functions – user interface, of physical IP network (data center fabric) and the virtual application logic and data access. In other words, a VM network residing in virtualized hosts. Network Segmentation could be hosting a Web tier, Application tier or Database tier (Isolation), Traffic flow control using firewalls and IDS/IPS or a combination of tiers in a data center. form the primary network-based security techniques with the first one as the foundation for the other two. In this paper, we From the description of the role of VMs, it should be describe and analyze three generations of network segmentation obvious that they are the counterparts of Web Server, techniques – Virtual Switches & Physical NIC-based, VLAN- Application Server and Database Server in virtualized data based & Overlay-based. We take a detailed look at the overlay- centers, their only difference being that they run on virtual based virtual network segmentation and its characteristics such machines instead of on physical machines. Hence VMs are as scalability and ease of configuration. entities or nodes that need to be connected to each other (e.g., enable one application tier to communicate with another – A Keywords-Virtual Machine; Virtual Network; Hypervisor; VLAN; web server to communicate with Application server) and also Overlay-based Network; Network Segmentation be accessible to entities external to the data center (e.g., users accessing the application running on the VMs).