Đề thi chứng chỉ quốc tế nghề cơ bản về công nghệ mạng - Các câu hỏi cơ bản - Đề 1

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Đề thi chứng chỉ quốc tế nghề cơ bản về công nghệ mạng - Các câu hỏi cơ bản - Đề 1CCNA – Basic QuestionsQuestion 1For which type of connection should a straight-through cable be used?A. switch to switchB. switch to hubC. switch to routerD. hub to hubE. router to PCAnswer: CExplanationTo specify when we use crossover cable or straight-through cable, we should remember:Group 1: Router, Host, ServerGroup 2: Hub, SwitchOne device in group 1 + One device in group 2: use straight-through cableTwo devices in the same group: use crossover cableIn this case we can use straight-through cable to connect a switch to a router -> C iscorrect.Question 2Which type of cable is used to connect the COM port of a host to the COM port of arouter or switch?A. crossoverB. straight-throughC. rolledD. shielded twisted-pairAnswer: CExplanationThe correct question should be “Which type of cable is used to connect the COM port ofa host to the CONSOLE port of a router or switch?” and the correct answer is rollovercable. But we can’t plug this rollover cable directly into our host because it will not work.We often use a RJ45 to DB9 Female cable converter as shown below:Question 3What is the first 24 bits in a MAC address called?A. NICB. BIAC. OUID. VAIAnswer: CExplanationOrganizational Unique Identifier (OUI) is the first 24 bits of a MAC address for anetwork device, which indicates the specific vendor for that device as assigned by theInstitute of Electrical and Electronics Engineers, Incorporated (IEEE). This identifieruniquely identifies a vendor, manufacturer, or an organization.Question 4In an Ethernet network, under what two scenarios can devices transmit? (Choose two)A. when they receive a special tokenB. when there is a carrierC. when they detect no other devices are sendingD. when the medium is idleE. when the server grants accessAnswer: C DExplanationEthernet network is a shared environment so all devices have the right to access to themedium. If more than one device transmits simultaneously, the signals collide and cannot reach the destination.If a device detects another device is sending, it will wait for a specified amount of timebefore attempting to transmit.When there is no traffic detected, a device will transmit its message. While thistransmission is occurring, the device continues to listen for traffic or collisions on theLAN. After the message is sent, the device returns to its default listening mode.So we can see C and D are the correct answers. But in fact “answer C – when they detectno other devices are sending” and “when the medium is idle” are nearly the same.Question 5Which two benefits are provided by using a hierarchical addressing network addressingscheme? (Choose two)A. reduces routing table entriesB. auto-negotiation of media ratesC. efficient utilization of MAC addressesD. dedicated communications between devicesE. ease of management and troubleshootingAnswer: A EQuestion 6When a host transmits data across a network to another host, which process does the datago through?A. standardizationB. conversionC. encapsulationD. synchronizationAnswer: CExplanationTo transmit to another host, a host must go through the TCP/IP model (very similar to theOSI model). At each layer, the message is encapsulated with that layer’s header (andtrailer if it has). This process is called encapsulation.Question 7Which two Ethernet fiber-optic modes support distances of greater than 550 meters?A. 1000BASE-CXB. 100BASE-FXC. 1000BASE-LXD. 1000BASE-SXE. 1000BASE-ZXAnswer: C EExplanationBelow lists the cabling standards mentioned aboveStandard Cabling Maximum length1000BASE- Twinaxial cabling 25 metersCX100BASE-FX Two strands, multimode 400 m1000BASE- Long-wavelength laser, MM 10 km (SM)3 km (MM)LX orSM fiber1000BASE- Short-wavelength laser, MM 220 m with 62.5-micron fiber; 550SX fiber mwith 50-micron fiber1000BASE- Extended wavelength, SM 100 kmZX fiberNote:+ MM: Multimode+ SM: Single-mode(Reference: The official self-study test preparation guide to the Cisco CCNA INTROexam 640-821)Question 8Refer to the exhibit. What type of connection would be supported by the cable diagramshown?Pin Color Function Pin Color Function 1 White/Green TX+ 1 White/Green TX+ 2 Green TX- 2 Green TX- 3 White/Orange RX+ 3 White/Orange RX+ 6 Orange RX- 6 Orange RX-A. PC to routerB. PC to switchC. server to routerD. router to routerAnswer: BExplanationFrom the “Pin” and “Color” in the exhibit we know that this is a straight-through cable soit can be u ...