Rangkaian mudah alih itu laju.

In Malay, a present-tense to be verb is often omitted.

So:

• Rangkaian mudah alih itu laju = The mobile network is fast

Malay commonly links the subject directly to an adjective or noun without using a separate word for is.

Compare:

• Dia tinggi = He/She is tall
• Rumah itu besar = The house is big

So laju simply functions as the predicate adjective here.

Rangkaian means network.

It can be used for different kinds of networks depending on context, such as:

• computer networks
• communication networks
• broadcast networks

In this sentence, it refers to a mobile network.

Mudah alih literally means something like easy to move or portable/mobile.

It is a fixed expression made of:

• mudah = easy
• alih = move/transfer/shift

Together, mudah alih is commonly used to mean mobile or portable, depending on the context.

So:

• telefon mudah alih = mobile phone
• peranti mudah alih = mobile device
• rangkaian mudah alih = mobile network

Even though it is two words, you should learn it as one set phrase.

In Malay, demonstratives like ini and itu usually come after the noun phrase.

So:

• rangkaian itu = that network / the network
• rangkaian mudah alih itu = that mobile network / the mobile network

This is different from English, where this/that comes before the noun.

A useful pattern is:

• noun + modifier(s) + ini/itu

Examples:

• rumah besar itu = that big house
• kereta baru ini = this new car

It can feel like either one, depending on context.

Its basic meaning is that, but in many sentences it also helps make the noun definite, so in natural English it may be translated as the.

So rangkaian mudah alih itu could be understood as:

• that mobile network
• or simply the mobile network

Malay does not have articles like a and the, so words like itu often help show definiteness.

Because laju is the adjective describing the subject, and in this type of sentence it comes after the subject phrase.

Structure:

• Rangkaian mudah alih itu = subject
• laju = predicate adjective

So the sentence pattern is basically:

• [subject] + [adjective]

Examples:

• Internet itu perlahan = The internet is slow
• Telefon ini mahal = This phone is expensive

Here laju means fast.

It is similar to cepat, but there is a slight difference in feel:

• laju often describes speed, motion, or performance
• cepat often means quick, rapid, or soon

In everyday speech, there is overlap, and both can sometimes be translated as fast.

For a network or internet connection, laju sounds very natural:

• Internet ini laju = This internet is fast

If you said cepat, people would still understand, but laju is often the more natural choice for speed/performance.

No. It is a correct and understandable phrase, but there are other possibilities depending on context and style.

For example:

• rangkaian mudah alih = mobile network
• jaringan mudah alih = mobile network
• rangkaian selular = cellular network

Rangkaian and jaringan can both mean network, though usage may vary by region or field.
Selular is closer to cellular specifically.

So the sentence given is good Malay, but it is not the only possible wording.

Malay does not have articles like English a/an/the.

Instead, definiteness is understood from:

• context
• word order
• words like ini and itu

So English needs:

• the mobile network

But Malay can simply say:

• rangkaian mudah alih
• or rangkaian mudah alih itu if it wants to sound more definite or point to a specific one

You can negate the adjective with tidak:

• Rangkaian mudah alih itu tidak laju = The mobile network is not fast

You can also soften it:

• Rangkaian mudah alih itu tidak begitu laju = The mobile network is not very fast
• Rangkaian mudah alih itu kurang laju = The mobile network is less fast / not very fast

For adjectives like laju, tidak is the normal negator.

Yes. That is perfectly natural.

It means:

• The mobile network is very fast

You can also use other degree words:

• agak laju = quite fast
• terlalu laju = too fast
• cukup laju = fast enough

These words usually come before the adjective:

• sangat laju
• agak laju
• terlalu laju

A simple learner-friendly pronunciation is roughly:

• rang-KAI-an

The ng is like the sound in sing.
The kai part is stressed more clearly in careful speech.

And the whole sentence can be approximated as:

• rang-KAI-an MOO-dah AH-lih EE-too LA-joo

This is only an approximation for English speakers, but it should help you get started.

For a normal, neutral sentence, it is best to keep this order:

• Rangkaian mudah alih itu laju

That is the standard pattern.

If you change the order too much, it may sound unnatural or become a different structure. For beginners, the safest formula is:

• noun phrase + adjective

So for now, treat this sentence as a model:

• Telefon itu mahal = That phone is expensive
• Kereta itu baru = That car is new
• Rangkaian mudah alih itu laju = The mobile network is fast