QA Answers

1 What is the maximum segment size in 10BaseT? 100 meters

2 What is the maximum segment size in 10Base2? 185 meters

3 What is the maximum segment size in 10Base5? 500 meters

4 What is the maximum segment size in 100BaseT? 100 meters

5 What is the maximum segment size in 1000BaseT? 100 meters

6 What does the acronym DIX stands for? Digital, Intel, Xerox

7 What are the three layers of hierarchical design? Core, distribution, and access

8 At what percent utilization are Ethernets over-utilized? 40 percent

9 At what percent utilization are Token Ring networks over-utilized? 70 percent

10 At what percent utilization are FDDI networks over-utilized? 70 percent

11 What is the maximum recommended percentage of broadcasts on the network? 20 percent

12 What is the standard(s) for Gigabit Ethernet? IEEE 802.3z (for fiber and copper) IEEE 802.3ab (for UTP)

13 What standard governs Token Ring? IEEE 802.5

14 What media implements a dual-ring and forwards tokens? Fiber Data Distributed Interface (FDDI)

15 Routers operate on which layer of the OSI model? Network layer

16 Switches operate on which layer of the OSI model? Data link layer

17 Repeaters operate on which layer of the OSI model? Physical layer

18 Bridges operate on which layer of the OSI model? Data link layer

19 Transceivers operate on which layer of the OSI model? Physical layer

20 Are bridges protocol transparent? Yes

21 When switches implement cut-through switching mode, what is not verified to check for frame errors?

Frame Check Sequence (FCS)

22 True or False: A repeater keeps a table of each MAC address on its ports and forwards frames accordingly.

False. Repeaters are Layer 11 devices. They do not keep a table of MAC addresses.

23 True or False: Routers forward frames based on the destination MAC address. False. No, they forward based on Layer 3 addresses.

24 True or False: Bridges forward frames based on the source MAC address. False. It is based on the destination MAC address.

25 What LAN media uses dual counter rotating rings? FDDI

26 Which Cisco device provides 48 ports of 10/100 Ethernet with 2 Gb uplinks? Catalyst 2948G

27 What are the components of the three-part firewall system?

The isolation LAN, outside filtering router, and inside filtering router.

28 What is the encoding scheme of 10-Mbps Ethernet? Manchester

29 What is the encoding scheme of Token Ring?

Differential Manchester

30 100BaseT forwards frames at what speed? 100 Mbps

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