Game - Name a Layer2 protcol

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spidey07

No Lifer
Aug 4, 2000
65,469
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Just for fun state a layer2 protcol and what it does. It can be ANY layer2 protocol and isn't just LANs. No googling/cheating!

I'll start.

802.1d - Spanning tree. Uses layer2 messages and an algorithm to detect and prevent bridging loops.
 
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jlazzaro

Golden Member
May 6, 2004
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ill go with the obvious L2TP, or Layer 2 Tunneling Protocol.

Microsoft's PPTP and Cisco's L2F protocols had sex, got pregnant, and 9 months later spit out this baby for tunnelling VPN traffic over the internet.
 
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spidey07

No Lifer
Aug 4, 2000
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Yeah, it's a session layer protocol dufuss. :p

CDP qualifies, but you didn't give description. :D FAIL

802.11b - layer2 wireless protocol consisting of messages to manage end stations, for example AP and client.
 
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realEZE

Member
Apr 19, 2007
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PPPoE - Point to Point Protocol over Ethernet. Establishes a virtual point to point connection between a DSL line and a broadband aggregation router. You're probably all using this at home now (if you have DSL).

The oE part has nothing to do with your modem's ethernet port, rather it has to do with the aggregation router and the DSL aggregator.

PPPoE largely takes over from PPPoA, as the carriers move from ATM aggregation equipment to the simpler Ethernet gear.
 
her209

her209

No Lifer
Oct 11, 2000
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Without looking, I'm going to throw out, 802.1x - used to authenticate connecting interfaces.
 
her209

her209

No Lifer
Oct 11, 2000
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How about this one?

ARP - used to resolve which interface has which IP
 
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spidey07

No Lifer
Aug 4, 2000
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Originally posted by: her209
How about this one?

ARP - used to resolve which interface has which IP
Click to expand...

One of the most important if there ever was one. :cookie: Although I don't know if it classifies as a pure layer2 protocol. I'm pretty sure it's a layer3 one.

Although you forgot a brief description!

Frame Relay - Basic L2 protocol to identify and specify virtual circuits. Nothing more than an L2 marking as well as rudimentary flow control at L2.
 
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nightowl

Golden Member
Oct 12, 2000
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802.1q - VLAN trunking - allows one physical link to carry multiple vlans across it by using tags to identify which vlan a frame belongs to - standard to the Cisco originated feature ISL
 
A

acaeti

Member
Mar 7, 2006
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PPP - good old modem-style point-to-point communication protocol
FDDI - token ring for fiber
MPLS - fancy schmancy VLANs (sorta)
 
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cmetz

Platinum Member
Nov 13, 2001
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spidey07, ATM. (some confused folks think otherwise, but we know where ATM belongs...)
 
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spidey07

No Lifer
Aug 4, 2000
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Originally posted by: cmetz
spidey07, ATM. (some confused folks think otherwise, but we know where ATM belongs...)
Click to expand...

Agreed.

That's a L2 protocol (If you can call it that) if there ever was one.

It's got L2 addressing, it frames (err, cells it) it, I call it L2.

But for this game you need to provide a brief description of it's function. ;)

Coming up with true L2 protocols can be difficult.....short on time....

CGMP - cisco proprietary messaging used to communicate multicast group membership to non IGMP aware L2 switches.

I'm surprised nobody has gone over the gauntlet of WAN protocols.
 
K

kobymu

Senior member
Mar 21, 2005
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Originally posted by: spidey07
CGMP - cisco proprietary messaging used to communicate multicast group membership to non IGMP aware L2 switches.
Click to expand...

That reminded me of cisco discovery protocol (CDP), I believe it is a pure layer two protocol, could be wrong though.

/edit
Damn, didn?t see it was already posted.
 
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cmetz

Platinum Member
Nov 13, 2001
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spidey07, sorry, I missed that part. ATM is a jobs creation program for circuit-switched people.

It's also a way to create statistically-multiplexed virtual circuits on one physical link. See Frame Relay and MPLS.

As my penance, how about: SONET - a TDM ring-topology network, known for its very fast ring wrap times if properly implemented. In the data world, ATM and PPP are both examples of higher-level L2s carried over SONET. Typically SONET is carried over STM (OCx) or STS links.
 
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spidey07

No Lifer
Aug 4, 2000
65,469
5
76
802.1x

Provides layer2 messaging used for authentication/authorization. Heavily used in wireless world, moving quickly into wired world.
 
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spyordie007

Diamond Member
May 28, 2001
6,229
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Originally posted by: acaeti
Isn't SONET more a layer 1 protocol, like Ethernet, ATM or ISDN?
Click to expand...
Ethernet, ATM and ISDN all reach up through Layer-2.

If it's defined in terms "higher up" than 1s and 0s it's probably not limited to Layer 1 ;)

That being the case I'm really surprised Ethernet hasn't been mentioned yet. Yes I know it exists at Layers 1 and 2, but a frame fits the bill right?
802.1x
Click to expand...
Although 802.1x itself is Layer-2 I'd be careful grouping it with other Layer-2 protocols since the majority of 802.1x deployments are dependent on upper-layer protocols (i.e. RADIUS).
 
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Sunner

Elite Member
Oct 9, 1999
11,641
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Networking is hardly my specialty, but I'll give it a shot :p

Token Ring, invented by a fellow Swede(I think) whose name escapes me.
Ring based(doh!) topology, pushed by IBM in ancient times when dinosaurs walked the earth and Ethernet was yet to be invented :)
 
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