Cisco – Is DTP enabled by default on the newest Cisco devices

Couple of things I see off-hand that need to be addressed. Your routing table doesn't include the 192.168.11.x network, thus your router doesn't know where to send the data, unless you omitted it from the text. It should be automatically included as a "connected" 'C' route as your others are. Part of the problem may lie in the fact that you are using port 1/1/24 in switchport mode, instead of routed mode.

From the text you included, it looks like your voice network is the default static route for all of your traffic.

I imagine you can ping the 192.168.11.1 interface? Can you ping the 192.168.11.2 interface?

Here's a quick fix to try...

config t# int gi1/1/24

config t-if# no ip address

config t# int vlan 11

config t-if# ip address 192.168.11.1 255.255.255.0

config t-if# int gi1/1/24

config t-if# switchport mode acce

config t-if# switchport acc vlan 11

Verify the 192.168.11.0/24 network is in the routing table and rerun the ip default gateway command if needed. Check for connectivity.

You can also try changing int gi1/1/24 into a routed port with the "no switchport" command. That should also solve your problem.

1. Yes, if I am reading things correctly it appears your understanding is correct.
2. Yes, there are implementations that will allow you to do link aggregation between a host and two switches. Switch stacking will allow a stack of individual switches to be managed as one device. Typically one of switches in the stack becomes the master for the stack allowing it to manage link aggregation across multiple switches. A second option is virtual switching which also allows this functionality across multiple switches even if they are not stacked. This typically requires higher end hardware, specific software versions and additional requirements in order to implement. Examples are virtual switching system (VSS)/multichassis EtherChannel (MEC)/virtual port channel (VPC) from Cisco or virtual chassis from Juniper.
3. No. One of the hard invariants (i.e. absolute requirements) for L2 networking is the sequential delivery of frames. In link aggregation this is enforced by requiring a flow to traverse only one link in the group. If there is any sort of delay on that link, this invariant can still be maintained. If a flow were traversing two links and one of the links were to experience a delay (even a very short one), this could result in frames being delivered out of order violating this invariant.

Ultimately, if you are running into a need to exceed the speed of a link for a single flow, you would need to upgrade your interfaces to the next available speed technology (i.e. 1G to 10G, 10G to 40G, etc). Cisco is also spearheading a push for *multigigabit" providing speeds of 2.5G or 5G across Cat5e/6 cabling at distances up to 100 meters.