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Open Ended Questions
Weekly Open Ended Question #7
Mar 9th
The answer to the sixth question has been added to the post.
Seventh question:
What is ODR? How does it work?
Please post answers in the comments (without Googling)!
Highlight for answer:
On-Demand Routing (ODR) is an enhancement to Cisco Discovery Protocol (CDP), a protocol used to discover other Cisco devices on either broadcast or non-broadcast media. ODR was added to CDP to advertise the connected IP prefix of a stub router via CDP.
Weekly Open Ended Question #6
Mar 3rd
Sorry for the lack of updates this week. I’ve just moved into a new place and I haven’t had time to get anything written up. I’m also lacking ideas lately, so leave some comments if you guys have any requests or ideas.
The answer to the fifth question has been added to the post.
Sixth question:
What is “stuck in active” (SIA), what protocol does it affect and how is it prevented?
Please post answers in the comments (without Googling)!
Highlight for answer:
SIA affects EIGRP. It happens when a router queries all of it’s EIGRP neighbors looking for a replacement route and is stuck waiting for replies. Some ways to prevent SIA are to use summary routes and/or stub networks.
Weekly Open Ended Question #5
Feb 26th
This is the fifth question in a series of OEQs. The answer to the fourth question has been added to the post.
Fifth question:
What protocol is used to automatically form trunks on a Cisco switch and how do you disable it?
Please post answers in the comments (without Googling)!
Highlight for answer:
Dynamic Trunking Protocol automatically forms trunks. It is disabled with “switchport nonegatiate”
Weekly Open Ended Question #4
Feb 24th
This is the fourth question in a series of OEQs. The answer to the third question has been added to the post.
Fourth question:
What is the 802.3ad standard, and what is its purpose?
Please post answers in the comments (without Googling)!
Highlight for answer:
802.3ad is better known as LACP. It is an IEEE link aggregation (aka etherchannel) protocol.
Weekly Open Ended Question #3
Feb 19th
This is the third question in a series of OEQs. The first and second questions were pretty popular, so I’ve decided to add more than one a week for a month or so. The answer to the second question has been added to the post.
Third question:
What are the port states of 802.1w?
Please post answers in the comments (without Googling)!
Answer:
The port states of 802.1w (RSTP) are Discaring, Learning and Forwarding.
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