Hi congratulations on starting, the level 2 is hugely important :) you'll be able to support children, families and your setting when qualified xx
Not sure which handbook you've been recommended,
page 58 of this book - on amazon.co.uk lists barriers to communication as;
- a visual or hearing impairment
- a different first or preferred language
- strong accent or dialect
- technical or specialist language not being understood (jargon)
- too much background noise or poor acoustics (high ceiling causing echo in the room)
- poor lighting so that facial expressions cannot be seen
Using that information the different agencies and support services that could help to overcome them would include those with information about disability aids (assistive technology) eg. hearing loops, braille equipment. Translation services, asking for explanations of jargon/specialist language, seeing how the environment/rooms can be altered to help reduce noise & sound travel.
If you need evidence for this criteria ask your setting about the agencies and services they access.
Best wishes