DHCP and DHCP Relay | Cisco CCNA 200-301



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37 réflexions sur “DHCP and DHCP Relay | Cisco CCNA 200-301

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    octobre 17, 2020 à 9:57
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    Keith can you please give us the name of the song in the beginning?

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    octobre 17, 2020 à 9:57
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    Keith, something that has baffled me is, is DHCP configurable on Cisco router as does on Microsoft Windows Servers, if not why too much talk about Cisco routers?

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    octobre 17, 2020 à 9:57
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    Keith, how are you? we have met at VMWare World 2018. I was wondering if in the future there will be CCNP videos (new track). That will be great!!!

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    octobre 17, 2020 à 9:57
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    Just wondering DHCP / DNS servers ( Windows vs Linux/Unix ). How often do you see one or the other?

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    octobre 17, 2020 à 9:57
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    It's always great to see you and you explain everything amazingly. I want to clear my confusion about dhcp Dora process that when dhcp server receives Discover a broadcast message from the client then in this message there is clients Mac address also then why dhcp broadcasts both offer and Ack message as it clearly knows client Mac address???
    Thanks.

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    octobre 17, 2020 à 9:57
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    Hi Keith,

    We can use dhcp service from
    cisco switch as well, should we
    know about this for new ccna?

    my vlan clients get assigned a dhcp address and subnet from switch dhcp but no gateway assigned to clients, i can ping all clients from different switches in different vlans across the switches using L2 switches in topology. I even added default-router in dhcp but no success.

    Thanks

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    octobre 17, 2020 à 9:57
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    Great video as always! These help me put logic to stuff I see at work that I do not fully understand at the the time.
    Thanks for putting these videos out there!

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    octobre 17, 2020 à 9:57
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    What I love more about your content is that you are so happy to teach this to us. It's always interesting to see someone teach with a smile on their face for the whole video. Great work Keith!

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    octobre 17, 2020 à 9:57
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    Great video as always Mr Barker…. I make conscious effort to watch at least 1 video every day and follow along with in my lab…

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    octobre 17, 2020 à 9:57
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    Thanks for the video and lab capture. Will you be doing a follow on for how DHCP is configured/used on CISCO gear such as a router or L3 switch?

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    octobre 17, 2020 à 9:57
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    It would be helpful if you could answer the following question

    What dora packets are broadcast or unicast ?? (Incase we donot have a relay agent)
    What dora packets are broadcast or unicast ?? (Incase we have a relay agent)

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    octobre 17, 2020 à 9:57
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    I see you have Wireshark in your desktop.. Can you teach Wireshark? To analyze slowness, traffic unreachable cause, little hack,.. I have seen more videos in Wireshark but I believe you make it simple understandable..

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    octobre 17, 2020 à 9:57
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    Off topic, but most sysadmins I talk to are woefully ignorant of networking. They don’t understand layers or encapsulation, so everything is just a alphabet soup of protocols. One guy was asking me how switches pass down DHCP requests to PCs.

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    octobre 17, 2020 à 9:57
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    Keith I'm so glad we live in a time where exceptional educators such as yourself are available for the entire world to view on the internet! You have a truly unique combination of gifts that have made preparing for the CCNA and a future in IT much more enjoyable than it would have been only studying a stuffy textbook. This information is truly interesting and exciting, it's great to have an instructor who brings it to life the way you do. Cheers!

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    octobre 17, 2020 à 9:57
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    Hi can anyone tell me what if dhcp server sends NACK to client then what will client do if dhcp server no acknowledge to client?

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    octobre 17, 2020 à 9:57
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    Hey Keith, Loved the video; however, your video contradicts a book I am using to prepare for the CCNA exam written by someone who is well established in the Cisco world – I don't want to mention names. In the book, the author talks about the DHCP discover and offer messages both being broadcast messages and how the client realizes the offer message is intended for him is by the client ID. From the book "Note that all hosts in the subnet receive the Offer message. However, the original Discover message lists a number called the client ID, which includes the host's MAC address, that identifies the original host." He goes onto to say "The rest of the hosts will receive the Offer message, but notice that the message lists another device's DHCP client ID, so the rest of hosts ignore the Offer message." He also shows in a diagram the offer message source address is from the DHCP server address and not the router interface ip address configured with the ip helper-address. I understand packets don't lie, so watching your video with the packet captures is very convincing. For preparing for the CCNA exam, should I base my studies on what you presented in this video that discover messages are always a broadcasts, abandon the information about a Client ID and the packet flow once the local router receives the offer and ack messages from the dhcp server rewrites the ip header with the ip address of the client as the destination and router ip address as the source? Thanks in advance – Paul

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    octobre 17, 2020 à 9:57
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    What is the point of client sending Request to Server when it got the offer. Why can't client just accept the Offer and send an acknowledgement to the server instead of client sending Request to server and server sending Acknowledgment to the client.

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    octobre 17, 2020 à 9:57
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    Hello. Thank you very much for putting this out there! it really helps me out 🙂 I have a question and it would really help me clarify somethings if you could answer it

    In my notes and when doing research TCP/IP layers are shown as 1. network interface layer 2. internet 3. transport 4. then application. while OSI is application presentation session transport network data link and physical. Why is it that when you described a TCP/IP layer it says application transport network data link physical? I am confused!! I did as much research as I cant but can't find the answer!!! please help me its bugging me so much!!!

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    octobre 17, 2020 à 9:57
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    Hi Keith

    I'm trying to replicate this in packet tracer. I've managed to get DHCP working for all PC's on my first vlan (eg VLAN10), but how do you configure the DHCP sever to give out addresses for clients that are in a separate vlan? (VLAN20)

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    octobre 17, 2020 à 9:57
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    46:32 why is the Layer 2 destination address that of server's default gateway? Shouldn't it be of SW2 aka the other end of the ethernet cable?

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