Domain Name System – Why does ping to FQDN fail but dig succeed?

When I try to ping a certain fully qualified domain name, I fail

$ ping test-customer-1.clients.jsonar.com
ping: test-customer-1.clients.jsonar.com: unknown name or service

however, dig et al. successful:

$ dig test-customer-1.clients.jsonar.com

; << >> DiG 9.9.4-RedHat-9.9.4-61.el7 << >> test-customer-1.clients.jsonar.com
;; global options: + cmd
;; Do you have the answer:
;; - >> HEADER << - opcode: QUERY, status: NOERROR, id: 57830
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1

;; PSEUDOSECTION OPT:
; EDNS: version: 0, flags:; stake: 4096
;; SECTION QUESTION:
; test-customer-1.clients.jsonar.com. IN ONE

;; SECTION RESPONSE:
test-customer-1.clients.jsonar.com. 3119 IN CNAME _r1.clients.jsonar.com.
_r1.clients.jsonar.com. 3119 IN CNAME _w1.clients.jsonar.com.
_w1.clients.jsonar.com. 3119 IN A 3.209.217.53

;; Query time: 15 ms
;; SERVER: 192.168.1.99 No. 53 (192.168.1.99)
;; WHEN: Fri 12 Apr 15:44:21 PDT 2019
;; MSG SIZE rcvd: 115

$ nslookup test-customer-1.clients.jsonar.com.
Server: 8.8.8.8
Address: 8.8.8.8 # 53

Non-authoritative answer:
test-customer-1.clients.jsonar.com canonical name = _r1.clients.jsonar.com.
_r1.clients.jsonar.com canonical name = _w1.clients.jsonar.com.
Name: _w1.clients.jsonar.com
Address: 3.209.217.53

$ host test-customer-1.clients.jsonar.com
test-customer-1.clients.jsonar.com is an alias for _r1.clients.jsonar.com.
_r1.clients.jsonar.com is an alias for _w1.clients.jsonar.com.
_w1.clients.jsonar.com has the address 3.209.217.53

Files:

$ cat /etc/resolv.conf
# Generated by NetworkManager
name server 192.168.1.99
8.8.8.8 name server

$ cat / etc / sysconfig / network-scripts / ifcfg-enp0s31f6
TYPE = "Ethernet"
BOOTPROTO = "dhcp"
DEFROUTE = "yes"
PEERDNS = "yes"
PEERROUTES = "yes"
IPV4_FAILURE_FATAL = "no"
IPV6INIT = "yes"
IPV6_AUTOCONF = "yes"
IPV6_DEFROUTE = "yes"
IPV6_PEERDNS = "yes"
IPV6_PEERROUTES = "yes"
IPV6_FAILURE_FATAL = "no"
IPV6_ADDR_GEN_MODE = "stable-privacy"
NAME = "enp0s31f6"
UUID = "cf566dc0-de91-497d-a045-560fddfbaf3e"
DEVICE = "enp0s31f6"
ONBOOT = "yes"
DNS1 = 8.8.8.8

$ cat /etc/nsswitch.conf | grep hosts
#hosts: db files nisplus nis dns
#hosts: mdns4_minimal files [NOTFOUND=return] dns myhostname
hosts: myhost DNS files