8: Network Troubleshooting in Java Integration barcode 3/9 in Java 8: Network Troubleshooting

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8: Network Troubleshooting using jar tomake code 39 full ascii for web,windows application Visual Studio Development Language Network Troubleshooting It is nearly imposs ible to troubleshoot any type of network connectivity issue without a network diagram that identifies IP addresses, network addresses, routing domains, and infrastructure devices such as routers, firewalls, switches, access points, servers, and so on. Generally, two types of network maps should be available:. Physical topology Logical topology A physical network diagram shows the physical layout of the devices connected to the network. You must know how devices are physically connected to troubleshoot problems at the physical layer, such as cabling or hardware problems. Information recorded on the diagram typically includes.

Device type Model a tomcat Code 3/9 nd manufacturer Operating system version Cable type and identifier Cable specification Connector type Cabling endpoints. Figure 8-32 shows a physical network diagram that provides information about the physical location of the network devices, the types of cabling between them, and the cable identification numbers. This information is used primarily to troubleshoot physical problems with devices or cabling. It is also required when conducting network upgrades and future planning.

In addition to the physical network diagram, some administrators also include actual photographs of their wiring closets as part of their network documentation. A logical network diagram shows how data is transferred on the network. Symbols are used to represent network elements such as routers, servers, hubs, hosts, VPN concentrators, and security devices.

Information recorded on a logical network diagram may include. Device identifiers awt 3 of 9 IP address and subnet mask Interface identifiers Connection type DLCI for virtual circuits. Accessing the WAN, CCNA Exploration Companion Guide Site-to-site VPNs Routing protocols Static routes Data-link protocols WAN technologies used Figure 8-32 Physical Topology Wiring Closet A SVR barcode 39 for Java 1 Rack 1 Shelf 3 Ethernet-R2-SVR1 T1-R2-R1 (Leased) R2 Rack 2 Shelf 1 Building A (Main Office) T1-R2-SRV2 (Leased) T1-R2-R3 Frame Relay Cloud ISP WEB Server (Co-Located at ISP) T1-R3-R2 Wiring Closet S Rack 1 Shelf 1 Rack 1 Shelf 1 ISP Facility SVR2. WEB/TFTP Server Wiring Closet B R1 Ethernet-R1-S1 Ethernet-R1-S2 Ethernet-R3-S3 Rack 1 Shelf 2 Rack 1 Shelf 3 Ethernet-S2-PC2 Rack 1 Shelf 2 Ethernet-S3-PC3 Ethernet-S1-PC1 PC1 PC2 Rm 705 Conference Room Rm 701 Building B ( jsp barcode 3 of 9 Engineering). Sales Office (Remote Branch). Figure 8-33 shows a Code39 for Java logical network diagram. It s the same network as shown in Figure 832, but this time it provides logical information such as specific device IP addresses, network numbers, port numbers, signal types, and DCE assignments for serial links. This information could be used to troubleshoot problems at all OSI layers.

. 8: Network Troubleshooting Figure 8-33 Logical Topology SVR1 192.168.20.

0/2 4 192.168.20.

1/24 Fa0/0 S0/0/0 WEB/TFTP Server 192.168.20.

254/24 10.1.1.

2/30 PPP R2 DTE 209.165.200.

224/27 209.165.200.

225/27 S0/1/0 S0/0/1 10.2.2.

1/30 Frame Relay 209.165.201.

0/27 WEB Server 192.165.201.

30/27 SVR2 10.1.1.

1/30 S0/0/0 DCE 192.168.10.

0/24 Fa0/0 192.168.10.

1/24 Fa0/1 192.168.10.

2/24 S1 Fa0/2 R1 192.168.11.

0/24 Fa0/1 192.168.11.

1/24 Fa0/1 S2 Fa0/2 192.168.11.

2/24 Fa0/1 S3 Fa0/2 192.168.30.

2/24 10.2.2.

2/30 DTE S0/0/1 192.168.30.

0/24 R3 Fa0/0 192.168.30.

1/24 DCE S0/0/1 ISP. 209.165.200.

226/27. Building B PC1 Admin PC2 Engineering PC3 Demo PC Physical Layer Troubleshooting The physical layer Code-39 for Java transmits bits from one computer to another and regulates the transmission of a stream of bits over the physical medium. The physical layer is the only layer with physically tangible properties, such as wires, cards, and antennas..

Symptoms of Physical Layer Problems Failures and subopt swing barcode code39 imal conditions at the physical layer not only inconvenience users but also can impact the entire company s productivity. Networks that experience these kinds of conditions usually come to a grinding halt. Because the upper layers of the OSI model depend on the physical layer to function, a network technician must be able to effectively isolate and correct problems at this layer.

A physical layer problem occurs when the physical properties of the connection are substandard, causing data to be transferred at a rate that is consistently less than the rate of data flow established in the baseline. If there is a problem with suboptimal operation at the physical layer, the network may be operational, but performance is consistently or intermittently lower than the level specified in the baseline..

Accessing the WAN, CCNA Exploration Companion Guide Common symptoms of j2se 3 of 9 barcode physical layer problems include the following:. Loss of connectivit y: If a cable or device fails, the most obvious symptom is a loss of connectivity between the devices that communicate over that link or with the failed device or interface. This can be discovered through a simple ping test. Intermittent loss of connectivity could indicate a loose or oxidized connection.

Error indicators: Error messages reported on the device console indicate a physical layer problem. Special LEDs on infrastructure equipment can also provide visual clues to physical problems. Either the LED is inactive, or the color indicates a problem.

High collision counts: High collision count usually is not a problem in a modern switched network. However, Ethernet networks using shared media hubs could suffer greatly. Although collisions are expected in a shared media environment, the average collision counts generally should be less than 5 percent.

Collision-based problems may often be traced back to a bad cable or interface. As well, if the collision count gets too high and overwhelms the device, the physical layer could fail..

Unlikely symptoms r Code-39 for Java elated to the physical layer include network congestion and high CPU utilization. For example, assume that a link has failed because of a physical problem such as a faulty cable, causing traffic to be redirected to a lower-capacity link. This could create a network bottleneck and cause congestion on the router interface.

The router would also experience a higher CPU utilization rate..
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