accessing the wan chapter 2 pdf

... –Data is encapsulated by the sending router –The frame is sent on a physical medium to the WAN –There are various ways to traverse the WAN, –The receiving router uses the same communications ... RS-232C interface that a computer uses to exchange data with a modem or other serial device •The DCE is the RS-232C interface that a modem or other serial device uses in exchanging data with the ... Receiver/Transmitter (UART) chip on the motherboard The UART is the DTE agent of your PC and communicates with the modem or other serial device, which, in accordance with the RS-232C standard, has a complementary

Ngày tải lên: 05/07/2014, 03:20

... for the number of ports. • 3 protocols X 2 directions X 2 directions = 12 [...]... 255 . 255 . 255 .0, you could take the 255 . 255 . 255 . 255 and subtract from the subnet mask – The ... . 255 . 255 .240, – take 255 . 255 . 255 . 255 and subtract the subnet mask 255 . 255 . 255 .240 – The solution this time produces the. .. 0.0.0. 15 Example 3: assume you wanted ... only networks 192.168.10.0 and 192.168.11.0 – take 255 . 255 . 255 . 255 and subtract the subnet mask 255 . 255 . 254 .0 – The result is 0.0.1. 255 ITE 1 Chapter 6 © 2006 Cisco Systems,

Ngày tải lên: 05/07/2014, 03:20

... •The DCE connect subscribers to a communication link on the WAN –Data Terminal Equipment (DTE) - The customer devices that pass the data for transmission over the WAN •The DTE connects to the ... describes the interface between the DTE and the DCE –EIA/TIA-232 - This protocol allows signal speeds of up to 64 kb/s on a 25-pin D-connector over short distances It was formerly known as RS-232 The ... connect to the service provider network •These interfaces may be serial connections or other WAN interfaces –Core router - A router that resides within the middle or backbone of the WAN rather than

Ngày tải lên: 05/07/2014, 03:20

... there are no hourly charges Trang 6The Frame Relay WAN ƒ When you build a WAN, there is always 3 components, –DTE –DCE –The component sits in the middle, joining the 2 access points ƒ In the ... Trang 1Accessing the WAN – Chapter 3 Trang 2Objectives ƒ In this chapter, you will learn to: – Describe the fundamental concepts of Frame Relay technology in terms of enterprise WAN services, ... on each LAN is the DTE –A serial connection, such as a T1/E1 leased line, connects the router to the Frame Relay switch of the carrier at the nearest POP for the carrier –The Frame Relay

Ngày tải lên: 05/07/2014, 03:20

... analysis Trang 28The Network Security Wheel ƒ The security policy is the four steps of Security Wheel ƒ Step 1: Secure –Secure the network by applying the security policy and implementing the following ... Trang 11 Accessing the WAN – Chapter 4 Trang 2Objectives ƒ In this chapter, you will learn to: – Identify security threats to enterprise ... of these groups differently –Each group should only be shown the portion of the policy appropriate to their work and level of access to the network –One document is not likely to meet the

Ngày tải lên: 05/07/2014, 03:20

... data to the computer over an Ethernet connection In the upstream direction, – the CM decodes the digital information from the. .. in either direction at the same time The following ... subscriber to the cable operator, the incoming frequencies are in the range of 5 to 42 MHz ITE 1 Chapter 6 © 2006 Cisco... between the CPE modem and the CO DSLAM The voice channel ... the signals from the cable operator to the subscriber, the outgoing frequencies are in the range of 50 to 860 MHz –Upstream: Transmitting the signals in the reverse path from the

Ngày tải lên: 05/07/2014, 03:20

... When traffic from PC1 is destined for the web server at 209.165.201.1, router R2 must translate the address In this case, IP address 209.165.200.226 is used as the inside global address for PC1 Outside ... configured In the figure, assume that an ISP has been configured to provide select customers with IP addresses from the 209.165.201.0 / 27 range The ouput confirms the assigned address Trang 15© 2006 ... Trang 1© 2006 Cisco Systems, Inc All rights reserved Cisco Public Accessing the WAN – Chapter 7 Trang 2© 2006 Cisco Systems, Inc All rights reserved Cisco Public Objectives Trang 3© 2006 Cisco

Ngày tải lên: 05/07/2014, 03:20

... Trang 22Troubleshooting Tools: Research Activity ƒ The following are links to various troubleshooting tools Trang 23WAN Communications ƒ WAN technologies function at the lower three layers of the ... 24Steps in WAN Design these are the steps for designing or modifying a WAN: ƒ Step 1 Locate LANs - Establish the source and destination endpoints that will connect through the WAN ƒ Step 2 Analyze ... a WAN link, you need to analyze the traffic characteristics specific to each LAN that is connected to the WAN Trang 26WAN Topology Considerations ƒ Designing a WAN topology consists of the

Ngày tải lên: 05/07/2014, 03:20

... papers are cited in the text, as needed, but they are not included in Tables 2.2,2.3, and 2.4. Process and matrix distribution studies (Table 2.2, Figure 2.1) generally measured the concentration ... assessing the occurrence and distribution of pesticides in the atmosphere are from studies classified as state and local monitoring studies. 2.2 GEOGRAPHIC DISTRIBUTION Figures 2.1,2.2, and 2.3 ... Pankow and others, 1993; Turpin and others, 1993; Goss, 1993; Hart and Pankow, 1994). 2.4 TARGET ANALYTES Most of pesticides investigated in the studies listed in Tables 2.2, 2.3, and 2.4 can

Ngày tải lên: 12/08/2014, 05:21

... Loopback1 C 172.30.0.0/16 is directly connected, Loopback2 C 192.168.1.0/24 is directly connected, Serial0 172.16.10.0/24 lo1 172.16.20.0/24 lo2 172.16.30.0/24 lo3 172.16.40.0/24 lo4 Trang 32Static ... FastEthernet0 C 192.168.1.0/24 is directly connected, Serial1 Trang 15Static Routes via Ethernet InterfacesRouterB(config)#ip route 172.16.1.0 255.255.255.0 fastethernet 1 172.16.2.1 C 172.16.2.0 ... FastEthernet0 172.16.4.1 YES NVRAM up up Loopback1 172.20.0.1 YES manual up up Loopback2 172.30.0.1 YES manual up up Serial0 192.168.1.2 YES NVRAM up up 172.16.10.0/24 lo1 172.16.20.0/24

Ngày tải lên: 18/03/2014, 14:20

... 3H 2 O 1056 Na 2 SO 4 996 (NH 4 ) 2 HPO 4 913 NaNO 3 1067 Na 2 SO 4 ⋅ 10H 2 O 992 NH 4 H 2 PO 4 913 KNO 3 1053 K 2 SO 4 983 NH 4 NO 3 1050 (NH 4 ) 2 SO 4 975 Mg(NO 3 ) 2 1064 MgSO 4 ⋅ 7H 2 O ... Mg(NO 3 ) 2 ⋅ 6H 2 O 1059 Chromates Ca(NO 3 ) 2 ⋅ 4H 2 O 1050 Sr(NO 3 ) 2 1056 Na 2 CrO 4 851 Ba(NO 3 ) 2 1047 K 2 CrO 4 852 Pb(NO 3 ) 2 1047 Solution Droplets Mixed Salts NO 3 – 1048 Na 2 SO 4 ... detectors. These modern detectors offer an array approxi- mately 25 mm long. The spatial resolution at the image field is in the vicinity of 22 to 25 µ m. Considering the fact that the entrance

Ngày tải lên: 18/06/2014, 19:20

... applied to the one-sheet bihyperboloidal electrode The 2z2−r2=C±, L829/frame/ch09 Page 198 Monday, January 31, 2000 3:09 PM Trang 3Novel Applications of the Electrodynamic Levitater for the Study ... t P m°( ), d m m m m 1 2 1 2 2 ∫ ( , ) = − π ∫ ( ) ( ) ( , )γ χ °( ) L829/frame/ch09 Page 201 Monday, January 31, 2000 3:09 PM Trang 6202 Aerosol Chemical Processes in the Environmentdroplet ... Control 201 SPEL Application Studies 201 Multicomponent Oil Droplet Studies 201 Hygroscopic Growth 202 Droplet Kinetics with Monolayers 204 Heterogeneous Reactions 205 Droplet Microencapsulation 206

Ngày tải lên: 18/06/2014, 19:20

... y 234 Th 24 d 4.2 m 2.4 × 10 5 y 3.8 d 222 Rn 1.6 × 10 3 y 226Ra 7.7 × 10 4 y 214 Pb 3 m 214 Bi 20 m 214 Po 6.4 × 10 −5s 210Pb 210 Bi 22.3 y 5 d 210 Po 138 d 27 m 206 Pb DK594X_book.fm Page 26 ... (99%) 4 s 219 Rn 11 d 223 Ra 19 d 211 Pb 8 × 10 −4s 211 Bi 207 Tl 207 Pb 223 Fr 22 y (1%) 22 m 3.3 × 10 4 y DK594X_book.fm Page 28 Tuesday, June 6, 2006 9:53 AM Trang 7Radionuclide Sources 29These ... 10 y 228 Ra 5.8 y 228 Ac 6.1 h 1.9 y 56 s 212 Pb 216 Po 220 Rn 224 Ra 11 h 208 Tl 61 m (64%) 3.1 m 61 m (36%) 3.1 × 10 −7s 208 Pb DK594X_book.fm Page 27 Tuesday, June 6, 2006 9:53 AM Trang 628

Ngày tải lên: 18/06/2014, 19:20

... containing radionuclidesfrom the 238U and 232Th series Typical amounts of 238U and 232Th in the air areabout 1 µBq/m3 If the dust particles in air are formed by organic matter, thentheir uranium and thorium ... determine the radon activity in dwellings.For example, the mean radon volume activity in dwellings in the Czech Republic TABLE 3.3 Typical Volume Activities of 222 Rn and 220 Rn in the Air (Outdoor ... mechanism by which radon and thoron enter the atmosphere?Both nuclides are the gaseous products of the decay of radium isotopes 226Ra and 224Ra, which belong to the uranium and thorium series and are

Ngày tải lên: 18/06/2014, 19:20

... belonging to the same natural series. The water passes through the solid grain either in the bedrock of the aquifers or in the soils from the drainage area. The rate of this weathering is not the same ... with the increase in the gradient of salinity due to the mixture of fresh- and saltwater. In this case, and because of the low concentrations of 226 Ra in the marine environment, the 226 ... amount of 239+240 Pu carried toward the Mediterranean Sea by the Rhone River is about 1 GBq/year. They state that the 239+240 Pu, 241 Am, and 137 Cs concentrations in the Rhone

Ngày tải lên: 18/06/2014, 19:20

... Mobile Suspensions 125 6.2.2 Chemical Forces Acting on Nanomaterials 128 6.2.2.1 Electrostatic or Coulomb Force 130 6.2.2.2 van der Waals Forces 131 6.2.2.3 Solvency Force 132 6.2.3 Implications ... 2 001 2 Therefore: WW aq kT ) . 2 001 2  (6.6) This derivation shows that the particulate concentration and temporal stability of heterogeneous sols depend on the size of the particles. If the ... difference (∆G)b etween X + H 2 O•H 2 O and H 2 O•X•H 2 O is referredtoasthefreeenergyofsolvation.Ifthefreeenergyofsolvationisthermo- dy namically advantageous (∆G <0 ), then the material will spontaneously

Ngày tải lên: 18/06/2014, 22:20

... Antibacterials 8 2.2.3 Coccidiostats and Antiprotozoals 10 2.2.4 Antifungals 10 2.2.5 Aquaculture Medicines 10 2.2.6 Hormones 10 2.2.7 Growth Promoters 10 2.2.8 Other Medicinal Classes 11 2.3 Pathways ... States 24 3.2.1.2 European Union 25 3.2.1.3 Japan 26 3.2.1.4 Australia 26 3.2.1.5 Canada 26 3.2.2 Current Guidelines: VICH and the VICH–EU Technical Guidance Document (VICH–EU–TGD) 27 3.3 ... Medicines in the Environment 7 Alistair Boxall, Mark Crane, Christian Corsing, Charles Eirkson, and Alex Tait 2.1 Introduction 7 2.2 Veterinary Medicine Use 7 2.2.1 Parasiticides 8 2.2.2 Antibacterials

Ngày tải lên: 18/06/2014, 22:20

... Halling-Sørensen 2000; Boxall et al. 2004). Over the past 10 years, the scientic community has become increasingly interested in the impacts of veterinary medicines on the environment, and there have ... substances are limited. The available data on the usage of ectoparasiticides on sheep (Liddel 2000; Pepper and Carter 2000) indicate that the organophosphate compound diazinon is the most widely used ... amounts (Boxall et al. 2007). 2.2.2 ANTIBACTERIALS Antibacterials are used in the treatment and prevention of bacterial diseases (Gustafson and Bowen 1997). Although their veterinary use follows

Ngày tải lên: 18/06/2014, 22:20