CCS/MSP432E401Y: How does the （udpecho）sample code configure static IP?

static void initIp(void *hCfg)
{
    const char *localIPAddr = "192.168.1.2";
    const char *localIPMask = "255.255.254.0";
    const char *gatewayIP   = "192.168.1.1";
    const char *domainName  = "demo.net";
    CI_IPNET netAddr;
    CI_ROUTE route;

    /* Add global hostname to hCfg (to be claimed in all connected domains) */
    CfgAddEntry(hCfg, CFGTAG_SYSINFO, CFGITEM_DHCP_HOSTNAME, 0,
            strlen(hostName), (unsigned char *)hostName, NULL);

    /* Configure static IP address on interface 1 */
    memset(&netAddr, 0, sizeof(netAddr));
    netAddr.IPAddr = inet_addr(localIPAddr);
    netAddr.IPMask = inet_addr(localIPMask);
    strcpy(netAddr.Domain, domainName);
    netAddr.NetType = 0;
    CfgAddEntry(hCfg, CFGTAG_IPNET, 1, 0,
                sizeof(netAddr), (unsigned char *)&netAddr, NULL);

    /* Add default gateway.  Since it's the default gateway, the destination
     * address and mask are both zero. */
    memset(&route, 0, sizeof(route));
    route.IPDestAddr = 0;
    route.IPDestMask = 0;
    route.IPGateAddr = inet_addr(gatewayIP);
    CfgAddEntry(hCfg, CFGTAG_ROUTE, 0, 0,
            sizeof(route), (unsigned char *)&route, NULL);
}