qr code generator c# tutorial 4: Bridges and Switches in Objective-C

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4: Bridges and Switches
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8 A If a MAC address is already in the CAM table and is seen again, the switch will update the CAM table appropriately, including a different port number if the MAC address is seen off of a different port B and D are incorrect because unknown destination MAC addresses are flooded C is incorrect because you should never see a broadcast address as a source MAC address under normal operating conditions 9 D If you are seeing multiple copies of the same unicast frame in a switched network, it is probably because STP is disabled or a misconfiguration of the switches is causing a layer 2 loop A would cause an increase in collisions on the segment B is incorrect because this problem can exist C actually prevents frames less than 64 bytes from being switched, typically solving late collision problems on the connected segment 10 B The switch will only update the CAM table for PC-B when it sees a frame coming from PC-B Since PC-C is in the CAM table, the switch would not flood the frame, making A an incorrect answer C is incorrect because the source address is PC-C, which it will still learn since it is a unicast address D is incorrect because if two devices support full-duplexing on a point-to-point link, it can be used
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501 502 503 504 Wireless LAN Technologies WLAN Standards WLAN Security WLAN Implementation 505 WLAN Devices Two-Minute Drill Self Test
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5: Wireless
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his chapter provides an introduction to wireless communications Wireless transmission has been used for a long time to transmit data by using infrared radiation, microwaves, or radio waves through a medium such as air With this type of connection, no wires are used Wireless LANs (WLANs) are becoming more and more common in companies networks, especially in small offices/home offices (SOHOs): instead of designing and implementing an Ethernet-based network, requiring the laying of cabling, it can be more cost effective to use wireless communications, or a combination of wired and wireless This can be true in older buildings where the physical infrastructure makes it difficult, if not impossible, to run Ethernet cables to each room or area And on top of this, many companies are deploying mobile services, such as PDAs, smart phones, and laptops that require constant access to e-mail and web-based services This chapter discusses the differences between LANs and WLANs, the common standards that are used, security concerns when using wireless, and common types of devices you ll find in a WLAN
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Wireless LAN Technologies
Before we begin a discussion of the actual standards used in a WLAN, you need to understand some of the technologies used in wireless communications This section introduces you to three groups of wireless technologies: narrowband, broadband, and circuit/packet data solutions Narrowband is the most common solution deployed in WLANs, so this chapter focuses on the technology and standards used in WLANs today
Narrowband, Broadband, and Packet Data Solutions
When you are choosing a wireless solution for your WAN or LAN, you should always consider the following criteria: speed, distance, and number of devices to connect Narrowband solutions typically require a license and operate at a low data rate Only one frequency is used for transmission of the wireless traffic: 900 MHz, 24 GHz, or 5 GHz Other technologies household wireless phones, for instance also use these technologies Through the use of spread spectrum, higher data rates can be
Wireless LAN Technologies
achieved by spreading the signal across multiple frequencies However, transmission of these signals is typically limited to a small area, such as a small campus network The broadband solutions fall under the heading of a Personal Communications Service (PCS) They provide lower data rates than narrowband solutions and cost about the same, but they provide broader coverage With the right provider, you can obtain national coverage Sprint PCS is an example of a carrier that provides this type of solution Circuit and packet data solutions are based on cellular technologies They provide lower data rates than the other two and typically have higher fees for each megabit transmitted; however, you can easily obtain nationwide coverage from almost any cellular phone company 3G is one of the more popular implementations used by cellular phone companies today; many cell phone companies even charge a flat rate for unlimited usage
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