Kỹ thuật viên kết nối bộ định tuyến.

• kỹ thuật viên = technician
• kết nối = to connect
• bộ định tuyến = router

So the sentence structure is basically:

technician + connect + router

Vietnamese usually follows Subject–Verb–Object, just like English.

So in this sentence:

• Kỹ thuật viên = subject
• kết nối = verb
• bộ định tuyến = object

That is why the sentence is ordered:

The technician + connects + the router

Vietnamese normally does not use articles like English a/an/the.

So kỹ thuật viên can mean:

• a technician
• the technician
• technicians in some contexts

And bộ định tuyến can mean:

• a router
• the router

Context tells you which one is meant.

Not by itself. Vietnamese verbs do not change form for tense the way English verbs do.

So kết nối can mean:

• connects
• is connecting
• connected
• will connect

depending on context.

If you want to make the time clearer, Vietnamese often adds time words such as:

• đã = past
• đang = ongoing action
• sẽ = future

Examples:

• Kỹ thuật viên đang kết nối bộ định tuyến. = The technician is connecting the router.
• Kỹ thuật viên đã kết nối bộ định tuyến. = The technician connected the router.

It is a multi-word noun phrase, but it functions as a single unit meaning technician.

Breakdown:

• kỹ thuật = technique / technical
• viên = member, worker, staff person in many compounds

Together, kỹ thuật viên means technician.

You should learn it as a set phrase.

Kết nối means to connect.

It is a very common verb used for:

• connecting devices
• linking systems
• making a connection physically or digitally

Examples:

• kết nối Internet = connect to the Internet
• kết nối máy tính với máy in = connect the computer to the printer

In your sentence, kết nối bộ định tuyến means connect the router.

Bộ định tuyến is the formal Vietnamese term for router.

Breakdown:

• bộ = set / device / unit
• định tuyến = routing

So bộ định tuyến literally means something like routing device.

In everyday speech, many Vietnamese speakers also simply say router, especially in tech contexts. But bộ định tuyến is a good standard Vietnamese term.

Usually no, not if you want to mean the device itself.

định tuyến by itself is more like routing or to route, not the noun router.

So:

• bộ định tuyến = router
• định tuyến = routing / route

If you mean the physical device, keep bộ.

A rough pronunciation guide is:

• Kỹ thuật viên ≈ kee thwut vee-en
• kết nối ≈ ket noy
• bộ định tuyến ≈ boh dinh twyen

A few important notes:

• Vietnamese pronunciation depends heavily on tones.
• đ is not the same as d. It sounds more like an English d.
• The marks above the vowels show tones and must be pronounced correctly.

If you are learning pronunciation, it is best to listen to native audio, because English-style spelling can only approximate the sounds.

They show the tones of the syllables. In Vietnamese, changing the tone changes the word.

For example, in this sentence you see marks such as:

• ỹ
• ậ
• ế
• ộ
• ế

These marks are not optional. They are part of the spelling and meaning.

For learners, the key point is:

• do not ignore the accents
• learn each word together with its tone

Yes, it is grammatical and natural, especially in a technical or instructional context.

It sounds like:

• a neutral statement
• a description of what the technician does
• an action in a technical setting

Depending on context, Vietnamese speakers might also say:

• Người kỹ thuật viên kết nối bộ định tuyến.
• Kỹ thuật viên đang kết nối bộ định tuyến.

But your original sentence is perfectly fine.

Yes. Vietnamese often adds với to show what something is connected to.

Example:

• Kỹ thuật viên kết nối bộ định tuyến với modem. = The technician connects the router to the modem.

So the pattern can be:

kết nối + object + với + other thing

That is a very useful structure to remember.