Exhibit 99.1

JOINT FILING AGREEMENT

In accordance with Rule 13(d)-1(k)(1) under the Securities Exchange Act of 1934, as amended, each of the undersigned hereby agrees to the joint filing with each other of the attached Statement on Schedule 13D and to all amendments to such Statement.

IN WITNESS WHEREOF, the undersigned hereby executed this Agreement as of this 8th day of November, 2017.

TEMASEK HOLDINGS (PRIVATE) LIMITED
By:	/s/ Christina Choo Soo Shen
	Name: Christina Choo Soo Shen
	Title: Authorized Signatory
SINGAPORE TECHNOLOGIES TELEMEDIA PTE LTD
By:	/s/ Chan Jen Keet
	Name: Chan Jen Keet
	Title: Company Secretary
STT COMMUNICATIONS LTD
By:	/s/ Chan Jen Keet
	Name: Chan Jen Keet
	Title: Company Secretary
STT CROSSING LTD
By:	/s/ Johnny Ong Seng Huat
	Name: Johnny Ong Seng Huat
	Title: Director