Basic Questions
Question 1
Question 2
Explanation
If the destination MAC address is not in the CAM table (unknown destination MAC address), the switch sends the frame out all other ports that are in the same VLAN as the received frame. This is called flooding. It does not flood the frame out the same port on which the frame was received.
Question 3
Question 4
Explanation
PoE monitoring and policing compares the power consumption on ports with the administrative maximum value (either a configured maximum value or the port’s default value). If the power consumption on a monitored port exceeds the administrative maximum value, the following actions occur:
+ A syslog message is issued.
+ The monitored port is shut down and error-disabled.
+ The allocated power is freed.
Question 5
Explanation
Spine-leaf architecture is typically deployed as two layers: spines (such as an aggregation layer), and leaves (such as an access layer). Spine-leaf topologies provide high-bandwidth, low-latency, nonblocking server-to-server connectivity.
Leaf (access) switches are what provide devices access to the fabric (the network of spine and leaf switches) and are typically deployed at the top of the rack. Generally, devices connect to the leaf switches. Devices can include servers, Layer 4-7 services (firewalls and load balancers), and WAN or Internet routers. Leaf switches do not connect to other leaf switches. In spine-and-leaf architecture, every leaf should connect to every spine in a full mesh.
Spine (aggregation) switches are used to connect to all leaf switches and are typically deployed at the end or middle of the row. Spine switches do not connect to other spine switches.
Question 6
Explanation
Whenever the physical transmission has problems, the receiving device might receive a frame whose bits have changed values. These frames do not pass the error detection logic as implemented in the FCS field in the Ethernet trailer. The receiving device discards the frame and counts it as some kind of input error. Cisco switches list this error as a CRC error. Cyclic redundancy check (CRC) is a term related to how the FCS math detects an error.
The “input errors” includes runts, giants, no buffer, CRC, frame, overrun, and ignored counts.
The output below show the interface counters with the “show interface s0/0/0” command:
Router#show interface s0/0/0
Serial0/0/0 is up, line protocol is up
Hardware is M4T
Description: Link to R2
Internet address is 10.1.1.1/30
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
--output omitted--
5 minute output rate 0 bits/sec, 0 packets/sec
268 packets input, 24889 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
251 packets output, 23498 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions DCD=up DSR=up DTR=up RTS=up CTS=up
Question 7
Explanation
A late collision is defined as any collision that occurs after the first 512 bits (or 64th byte) of the frame have been transmitted. The usual possible causes are full-duplex/half-duplex mismatch, exceeded Ethernet cable length limits, or defective hardware such as incorrect cabling, non-compliant number of hubs in the network, or a bad NIC.
Late collisions should never occur in a properly designed Ethernet network. They usually occur when Ethernet cables are too long or when there are too many repeaters in the network.
Reference: https://www.cisco.com/en/US/docs/internetworking/troubleshooting/guide/tr1904.html
Question 8
Question 9
Question 10
Question 11
Question 12
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Hello,
If I am not mistaken the explanation on question 5 (basic questions) is confusing:
Leaf (aggregation) switches
Spine (aggregation) switches
The spine should be the aggregation switch and the leaf the access switch.
Am I wrong?
@Anonymous: Yes, thanks for your detection, it is a typo. We have just updated it!
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Hi all,
I did the exam yesterday, there was a new question:
in an OSPF area, router A has not configured with router-ID, and has no loopback interface, how the router ID will be chosen:
the lowest IP add configured on an interface of the router
The highest IP add configured on an interface of the router (the correct answer)
No router ID
The highest IP add of the neighbour router interface
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@9tut @all
Question 1
Which two statements about the purpose of the OSI model are accurate? (Choose two)
A. Defines the network functions that occur at each layer
B. Facilitates an understanding of how information travels throughout a network
C. Changes in one layer do not impact other layer
D. Ensures reliable data delivery through its layered approach
Answer: A B
——-
This paragraph is quoted from Cisco 200-301 Official Cert Guide:
Reference Models
3.5.1
The Benefits of Using a Layered Model
These are the benefits of using a layered model to describe network protocols and operations:
• Assisting in protocol design because protocols that operate at a specific layer have defined information that they act upon and a defined interface to the layers above and below
• Fostering competition because products from different vendors can work together
• Preventing technology or capability changes in one layer from affecting other layers above and below
• Providing a common language to describe networking functions and capabilities
According to 3rd benefit “Preventing technology or capability changes in one layer from affecting other layers above and below” isn’t answer C a correct answer ?
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