Ujian Tengah Semester "Wireless Topology"

1. Which wireless NIC form factors aren't best for small wireless computer devices? : choose one ?
• PC-Card
• Compact Flash
• USB Adaptors
• Mini PC
2. What is the broadcast address of the subnet address 192.168.10.33 /29 ?
• 192.168.10.40
• 192.168.10.39
• 192.168.10.255
• 192.168.255.255
• Leave blank
3. What type information doesn't a wireless network support ?
   
   • E-mails
   • Web pages
   • database records
   • Hardware control 
   • Leave blank
4. What type of weather impacts RF Signals the most ?
   
   • Cloudy
   • Small Rain
   • Windy
   • Heavy Rain
   • Leave blank
5. What relatively new stadard applies to wireless MANs ?
   
   • 802.11 b
   • 802.11 g
   • 802.11 a
   • 802.11 16
   • Leave blank
6. This is not device in wireless network :
   
   • Access Point
   • NIC Wireless
   • Switch
   • Wireless Bridge
   • Leave blank
7. What isn't the source of RF interference? :
   
   • Cordless Phone
   • Microwaves Ovens
   • Bell Homes
   • Bluetooth Devices
   • Leave blank
8. Which medium access protocol is common with wireless networks
   
   • Collision
   • C S M A C A
   • C S M A C D
   • Media Control
   • Leave blank
9. What might a solution for interconnecting several LANs at separate but close locations to form a WAN?
• using multiple routers at each site
• using the same IP Addresses and subnets at all the sites
• using combination of wired and wireless devices
• using the same proxy server for all the LANs
• Leave blank
10. When using Extended Service Set, what is the recommended overlap for adjacent basic service set cells?
    
    • 20-25%
    • 10-15%
    • 15-20
    • 10-20%
    • Leave blank
11. What will a wireless client broadcast when it comes online?
    
    • Beacon
    • Probe Request
    • Probe Response
    • Probe Acknowledge
    • Leave blank
12. What is a wireless network topology that consists of nothing more than two or more personal computers?
    
    • basic infrastructure
    • base station-dialup
    • peer-to-peer
    • extended infrastructure
    • Leave blank
13. Which phenomena occurs in a WLAN when radio waves spread around obstacles in a building?
    
    • large-scale diffraction
    • small-scale diffraction
    • medium-scale diffraction
    • refraction
    • Leave blank
14. What are the three parts of a wireless client adapter?
    
    • PC card, dipole, LEDs
    • LEDs, transceiver, adapter
    • antenna, radio, LEDs
    • radio, antenna, power indicator
    • Leave blank
15. In the simplest wireless LAN configuration, all devices equipped with a client adapter can communicate directly with one another, Which term describes this configuration?
    
    • infrastructure
    • ad hoc
    • roaming
    • microcellular
    • Leave blank
16. Wireless LANs (WLANs) can operate at which of the following frequencies? (select two
    
    • 5,4 Ghz
    • 5 GHz
    • 5,8 Ghz
    • 2,4 Ghz
    • 2 Ghz
    • 2,8 Ghz
17. What are some of the benefit of WLANs? (choose three)
    
    • mobility
    • long distance
    • short and long term cost savings
    • no need for an ISP
    • flexibility
    • manageability
      
    • no need for traditional wired routers, switch and servers
18. Which wireless product utilize a direct sequence spread spectrum (DSSS) technology?
    
    • 802.11a
    • 802.11b
    • 802.11c
    • 802.11d
    • Leave blank
19. Which wireless product utilize a orthogonal frequency-division multiplexing (OFDM) technology?
    
    • 802.11a
    • 802.11b
    • 802.11c
    • 802.11d
    • Leave blank
20. What type information doesn't a wireless network support ?
    
    • E-mails
    • Web pages 
    • database records 
    • Hardware control

Tugas Bab Antenna Wireless

1. Antena umumnya terbagi dalam dua kategori, gambarkan perbedaan yang sama dan juga contoh setiap kategori!
   Jawab:
   Dua kategori antena yaitu antena Directional dan omnidirectional.
   
   • Antena Directional memancarkan energi RF terutama di satu arah. Jenis-jenis antena directional meliputi: Yagi, Solid parabola, Semi parabola, Patch atau panel.
   • Antena Omni-directional memancarkan energi RF yang sama ke segala arah horisontal. Radiasi ini mencakup 360 derajat horizontal. Jenis-jenis antena omni-directional meliputi: Mast Mount dan Rubber Dipole
     
     
2. Jelaskan tentang item yang harus dipertimbangkan ketika mendesain link wireless network: Radio line of sight, Earth bulge dan Fresnel zone !
Jawab: Ketika merancang sebuah bangunan ke gedung, jangan lupa tentang Fresnel Zone. Fresnel Zone adalah area elips segera sekitar jalan visual yang bervariasi, tergantung pada panjang lintasan sinyal dan frekuensi sinyal. Fresnel Zone dapat dihitung, dan harus diperhitungkan saat merancang link wireless. Pertimbangan utama dalam desain antar bangunan Fresnel Zone, yang dapat kita anggap sebagai Line of Sight. Untuk WLAN, Line of Sight lebih dari garis langsung antara dua antena. Line of Sight lebih dari sebuah elips yang jelas dari hambatan, dan harus account untuk pertumbuhan masa depan pohon. Karena Fresnel Zone Elips, antena harus dipasang cukup tinggi untuk memberikan izin pada titik tengah dari Fresnel Zone.
3.  Apakah yang dimaksud dari: Gain, Polarization dan Beamwidht dalam wireless terminology !
• Gain merupakan indikasi dari antena concertration kekuasaan terpancar dalam arah tertentu.
• Polarization adalah orientasi fisik dari elemen pada antena yang benar-benar memancarkan energi RF. Polarization merupakan fenomena fisik propagasi sinyal radio. Biasanya, setiap dua antena yang membentuk link dengan satu sama lain harus diatur agar polarization sama. Polarization biasanya disetel selama atau setelah waktu instalasi antena.
• Beamwidht adalah pengukuran yang digunakan untuk menggambarkan antena directional. Beamwidth kadang disebut half-power beamwidth. Ini adalah lebar total dalam derajat lobus radiasi utama, di sudut mana daya terpancar telah jatuh di bawah bahwa pada tengah dari lobus, dengan 3 dB (half-power).