ccna itexams 예제 문제 풀이 230620 (화) 문제 6 ~ 문제 15

문제 6. What is the primary function of a Layer 3 device?

 

>> 3계층 주요 기능?

>> network layer

 

>> 추측:

• D. to pass traffic between different networks

 

>> 이유:

networks 관련 단어가 포함되어있어서.

 

 

>> 정확한 분석: 종단간의 데이터 전달

 

>> 실제 답: D번.

 

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문제 7. Which two functions are performed by the core layer in a three-tier architecture? (Choose two.)

 

>> 모르겠음 (3-TIER, 코어 계층? , 관련 수행 기능?)

>> 관련 링크: https://www.mcmcse.com/cisco/guides/hierarchical_model.shtml

>> 관련 링크2: https://jaws-coding.tistory.com/9

3계층 구조(3 Tier- Architecture) 이해하기 [스마트인재개발원]

>> 요약:

3계층 구조: 어떠한 플랫폼을 3계층으로 나누어 별도의 논리적/물리적인 장치에 구축 및 운영하는 형태

 

• A. Provide uninterrupted forwarding service
• C. Ensure timely data transfer between layers

-- 이유: 클라이언트, 어플리케이션, 데이터 계층으로 서버를 모두 물리적으로 나누어 구성

-> 각각의 계층에서 변화일어나더라도 서로 영향 받지 않고 독립적으로 운영 가능.

 

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 문제 8:

What is a recommended approach to avoid co-channel congestion while installing access points that use the 2.4 GHz frequency?

 

추측 답:

• D. different overlapping channels

실제 답:

• A. different nonoverlapping channels

틀린 이유 추측: overlapping? -- 오버lapping하면 채널 간섭 일어남.

 

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문제 9

  A manager asks a network engineer to advise which cloud service models are used so employees do not have to waste their time installing, managing, and updating software that is only used occasionally. Which cloud service model does the engineer recommend?

 

추측 답: C. business process as service to support different types of service

실제 답:  D. software-as-a-service

 

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 문제 10. What are two functions of a Layer 2 switch? (Choose two.)

 

추측 답:

• D. moves packets between different VLANs
• E. makes forwarding decisions based on the MAC address of a packet

실제 답: 

• C. moves packets within a VLAN

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문제 11.  TCP, UDP 드래그 앤 드롭 문제

(외워야 함)

TCP: TELNET (23), HTTP(80), SMTP (25)

UDP: DNS - TCP에도 쓰임.(53), SNMP, RTP()

 

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문제 12. An engineer observes high usage on the 2.4GHz channels and lower usage on the 5GHz channels. What must be configured to allow clients to preferentially use
5GHz access points?

 

추측 답: A. Client Band Select

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문제 13. Which networking function occurs on the data plane? (봐도 모르겠음)

 

추측 답:

• D. forwarding remote client/server traffic

 

control plane:

in general is anything that’s needed in order to get routing working on that device, Control plane packets are destined to or locally originated by the router itself eg; routing updates

 

data plane:

is basically anything that goes *through* the router/switch, and not *to* the router/switch. this is your data packets going through your router and switch to your PC

 

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문제 14. Under which condition is TCP preferred over UDP?

 

추측 답: C

 

실제 답:

• C. TCP is used when data reliability is critical, and UDP is used when missing packets are acceptable.

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문제 15. 

cisco packet tracer 터미널 특이사항 (show interface TGE0/1/0)

신뢰성이 255/255 가 안정적이지만

현재 터미널에선  RELIABILITY 166/255로 보여서 안정성에 문제가 보인다.

 

추측 답:

• A. Interface errors are incrementing.