Coverage of topics for L1 , L2 and L3

vlrk

Hi All,

I am trying getting to know / brush up the skills on L1,L2 and L3. Query is what to cover ?.

I am thinking below topics..


L2 : VLAN , STP ,RSTP , VTP ,ARP ,BOTTP and DHCP
L3 : RIP,OSPF,BGP and IS-IS

IP : IP Addressing , Subnettting , Supernetting , IPv4 and IPv6

No idea on L1 .. at all what to cover..? .

I need inputs from you like , what else should be covered here .. ? .

Final objective is to get to know the domain of L1,L2 and L3 technologies.

Thanks
vlrk

CryptoQue

Layer 1 (physical layer) of the OSI covers bits, line configuration, transmission mode, data rates, cabling, wire speeds, voltage, physical media, etc. Some things to look into:

- Cabling Types & Speeds: Coax, Twisted Pair, Fiber
- Hubs
- Repeaters
- NIC Cards, DTE, DCE
- Full duplex, half duplex
- point-to-point, point-to-multipoint

blatini

https://learningnetwork.cisco.com/community/certifications/ccna/ccna-exam/exam-topics

vlrk

Thanks a lot ...

dppagc

CryptoQue wrote: »

Layer 1 (physical layer) of the OSI covers bits, line configuration, transmission mode, data rates, cabling, wire speeds, voltage, physical media, etc. Some things to look into:

- Cabling Types & Speeds: Coax, Twisted Pair, Fiber
- Hubs
- Repeaters
- NIC Cards, DTE, DCE
- Full duplex, half duplex
- point-to-point, point-to-multipoint

Out of topic but i thought hubs are obsolete in the market?

barberj66

dppagc wrote: »

Out of topic but i thought hubs are obsolete in the market?

They are and should never be used especially in a production environment. I think they are shown so much in CCENT because they highlight why you would use switches more in a network as it shows the effects of collisions.

I've certainly not seen any for sale any time recently

stryder144

dppagc wrote: »

Out of topic but i thought hubs are obsolete in the market?

barberj66 is correct, though I have heard of a few really small companies utilizing hubs.

CryptoQue

barberj66 wrote: »

They are and should never be used especially in a production environment. I think they are shown so much in CCENT because they highlight why you would use switches more in a network as it shows the effects of collisions.

I've certainly not seen any for sale any time recently

Correct...I only gave the example for exam purposes and not for real world use.

barberj66

CryptoQue wrote: »

Correct...I only gave the example for exam purposes and not for real world use.

Magic Johnson

stryder144 wrote: »

barberj66 is correct, though I have heard of a few really small companies utilizing hubs.

I saw a 30 user environment which had a hub here:

Router > Hub > 2x24p SW

and various hubs under desks despite cat5 being present.

Funnily enough they blamed ridiculous performance issues on the ISP.

That feel when you first see a hub in the wild that's actually in use:

CryptoQue

One day hubs will become nonexistent...but somehow some companies rather have a cost effective LAN verses a secure and stable LAN.