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Cisco Console CLI and OSI Model
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1
Question
What cable type connects a PC serial port to a Cisco console using a nine-pin adapter?
Answer
Rollover cable
2
Question
If a PC in the lab has a serial connection straight to RJ-45, what additional step is needed?
Answer
Patch cable connection
3
Question
How does a rollover cable differ from a straight-through in pin assignments?
Answer
Pins are mirrored
4
Question
When using USB for console access, what does the adapter do to the signal?
Answer
Rolls over straight into RJ-45
5
Question
What terminal speed setting ensures compatibility with Cisco console access?
Answer
9600 bits per second
6
Question
If flow control is enabled during console connection, what issue might occur?
Answer
Data transmission interruptions
7
Question
Why set parity bits to none in console terminal settings?
Answer
Cisco uses no parity for 8-bit ASCII
8
Question
What happens when entering 'EN' in user mode on Cisco CLI?
Answer
Enters privileged enable mode
9
Question
If a user forgets to exit enable mode, how can they return to user mode?
Answer
Enter 'disable' command
10
Question
In Cisco CLI, when would you use 'conf' to enter configuration mode?
Answer
To modify running configuration
11
Question
What distinguishes RAM from NVRAM in Cisco device memory usage?
Answer
RAM holds running-config; NVRAM holds startup-config
12
Question
If a switch reloads, which memory source loads the initial configuration?
Answer
NVRAM startup-config
13
Question
How does the running-config change during a CLI session?
Answer
Dynamically with entered commands in config mode
14
Question
Where is Cisco IOS software primarily stored for execution?
Answer
Flash memory
15
Question
What role does ROM play immediately after device power-on?
Answer
Runs bootstrap program to load IOS
16
Question
In the communication process, what does the encoder convert before transmission?
Answer
Message to signal
17
Question
If the transmission medium introduces noise, which component decodes the affected signal?
Answer
Receiver decoder
18
Question
Why does OSI model support multi-vendor environments effectively?
Answer
Open interconnections between layers
19
Question
What challenge did 'open' network computing face from vendors initially?
Answer
Resistance by incumbents
20
Question
In OSI rules, why can't layer 3 communicate directly with layer 5?
Answer
Only adjacent layers communicate
21
Question
If layer 2 fails its function, how does this impact layer 3 above it?
Answer
Layer 3 cannot perform routing
22
Question
What OSI benefit allows changes in physical layer without affecting application layer?
Answer
Modular layer independence
23
Question
How does OSI standardization enable hardware from different vendors to interoperate?
Answer
Common protocols across layers
24
Question
At physical layer, what action terminates the circuit after data transmission?
Answer
Deactivating physical signaling
25
Question
If incoming bits at physical layer are corrupted, what does it pass to layer 2?
Answer
Raw bit stream for error checking
26
Question
Why doesn't physical layer include the physical media in its scope?
Answer
Focuses on signaling, not media itself
27
Question
In data link layer, what verifies frame integrity using CRC?
Answer
Point-to-point checking and correction
28
Question
If a frame fails acknowledgment at data link, what protocol action follows?
Answer
Retransmission request
29
Question
How does data link layer's independent addressing benefit network design?
Answer
Separates from network layer IP
30
Question
What splits data link responsibilities between MAC and LLC sub-layers?
Answer
MAC for media access; LLC for framing