CNAME和Target

Last update: Thu Mar 20 2025 00:00:00 GMT+0000 (Coordinated Universal Time)

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開發人員

使用Adobe Client Care在Adobe Target中實作CNAME （規範名稱）支援的說明。使用CNAME來處理廣告封鎖問題或ITP相關（智慧型追蹤預防） Cookie政策。透過CNAME，會呼叫客戶擁有的網域，而不是Adobe擁有的網域。

請求Target中的CNAME支援

決定您的SSL憑證所需的主機名稱清單（請參閱底下的常見問題集）。

針對每個主機名稱，在您的DNS中建立指向一般Target主機名稱clientcode.tt.omtrdc.net的CNAME記錄。

例如，如果您的使用者端代碼是"cnamecustomer"，而您建議的主機名稱是target.example.com，則您的DNS CNAME記錄看起來會類似：

code language-none
`target.example.com. IN CNAME cnamecustomer.tt.omtrdc.net.`

note warning
WARNING
此步驟完成前，Adobe的憑證授權單位DigiCert無法核發憑證。因此，在此步驟完成之前，Adobe無法完成您的CNAME實作要求。

填寫此表單，並在您開啟要求CNAME支援的Adobe客戶服務票證時加入它：
- Adobe Target使用者端代碼：
- SSL憑證主機名稱（範例： target.example.com target.example.org）：
- SSL憑證購買者(強烈建議Adobe，請參閱常見問題集)： Adobe/客戶
- 如果客戶購買憑證（也稱為「自帶憑證」，BYOC），請填寫以下其他詳細資料：
  - 憑證組織（範例：範例Company Inc）：
  - 憑證組織單位（選用，例如：行銷）：
  - 憑證國家/地區（範例：美國）：
  - 憑證州/地區（範例：加州）：
  - 憑證城市（範例：聖荷西）：
如果Adobe正在購買憑證，Adobe會與DigiCert合作來購買憑證，並將其部署在Adobe的生產伺服器上。

如果客戶正在購買憑證(BYOC)，Adobe客戶服務會將憑證簽署要求(CSR)傳送給您。透過您選擇的憑證授權單位購買憑證時，請使用CSR 。核發憑證後，請將憑證復本及任何中繼憑證傳送至Adobe Client Care進行部署。

Adobe Client Care會在實作準備就緒時通知您。
將serverDomain 檔案更新為新的CNAME主機名稱，並在您的at.js設定中將overrideMboxEdgeServer設定為false 檔案。

常見問題集

下列資訊回答有關在Target中請求和實作CNAME支援的常見問題：

我可以提供我自己的憑證（自備憑證或BYOC）嗎？

您可以提供自己的憑證。不過，Adobe不建議使用此作法。如果Adobe購買並控制憑證，Adobe和您都能更輕鬆地管理SSL憑證生命週期。 SSL憑證必須每年續約。因此，Adobe Client Care必須每年與您連絡，才能及時取得新憑證。有些客戶可能難以及時產生更新的憑證。憑證過期時，因為瀏覽器拒絕連線，所以您的Target實作已受到危害。

WARNING

如果您要求Target自攜憑證CNAME實作，則需每年負責向Adobe Client Care提供更新的憑證。允許您的CNAME憑證在Adobe部署更新的憑證之前過期，會導致您的特定Target實作中斷。

我的新SSL憑證要多久才會過期？

所有Adobe購買的憑證都有效期為一年。如需詳細資訊，請參閱DigiCert關於1年憑證的文章。

我應該選擇哪些主機名稱？每個網域應該選擇幾個主機名稱？

Target CNAME實作只需要SSL憑證和客戶的DNS中每個網域有一個主機名稱。 Adobe建議每個網域使用一個主機名稱。有些客戶出於其自身目的（例如在測試環境中測試）而要求每個網域有更多主機名稱，此做法受到支援。

大多數客戶選擇類似target.example.com的主機名稱。 Adobe建議您遵循此作法，但最終還是由您來決定。請勿要求現有DNS記錄的主機名稱。這樣做會造成衝突，並延遲解決Target CNAME要求的時間。

我已經有Adobe Analytics的CNAME實作，可以使用相同的憑證或主機名稱嗎？

否，Target需要個別的主機名稱和憑證。

我目前的Target實作是否會受到ITP 2.x影響？

Apple智慧型追蹤預防(ITP) 2.3版匯入了CNAME遮蔽緩解功能，此功能可偵測Target CNAME實作，並將Cookie的有效期縮短為七天。目前Target沒有ITP CNAME遮罩緩解的因應措施。如需有關ITP的詳細資訊，請參閱Apple智慧型追蹤預防(ITP) 2.x。

部署CNAME實作時，可能會發生哪些服務中斷？

部署憑證時沒有服務中斷（包括憑證續約）。

不過，當您將Target實作程式碼（ at.js中的serverDomain）中的主機名稱變更為新的CNAME主機名稱(target.example.com)後，網頁瀏覽器會將回頭的訪客視為新訪客。回訪訪客的設定檔資料遺失，因為舊主機名稱(clientcode.tt.omtrdc.net)下的先前Cookie無法存取。由於瀏覽器安全模式的緣故，無法存取先前的Cookie。這種中斷只會在初次切換至新CNAME時發生。憑證更新不會產生相同的效果，因為主機名稱不會變更。

我的CNAME實作使用什麼金鑰型別和憑證簽章演演算法？

所有憑證預設為RSA SHA-256，金鑰則為RSA 2048位元。目前不支援大於2048位元的金鑰大小。

如何驗證我的CNAME實作準備好進行流量？

使用以下命令集(在macOS或Linux命令列終端機中，使用bash和curl >=7.49)：

將此Bash函式複製並貼到您的終端機中，或將函式貼到您的Bash啟動指令碼檔案中（通常是~/.bash_profile或~/.bashrc），以便該函式可在終端機工作階段中使用：

code language-none

code language-none
function adobeTargetCnameValidation { local hostname="$1" if [ -z "$hostname" ]; then echo "ERROR: no hostname specified" return 1 fi local service="Adobe Target CNAME implementation" local edges="41 42 44 45 46 47 48" local edgeDomain="tt.omtrdc.net" local edgeFormat="mboxedge%d%s.$edgeDomain" local poolDomain="pool.data.adobedc.net" local shards=5 local shardsFoundCount=0 local shardsFound="" local shardsFoundOutput="" local curlRegex="subject:.*CN=\|expire date:\|issuer:" local curlValidation="SSL certificate verify ok" local curlResponseValidation='"OK"' local curlEndpoint="/uptime?mboxClient=uptime3" local url="https://$hostname$curlEndpoint" local sslShopperUrl="https://www.sslshopper.com/ssl-checker.html#hostname=$hostname" local success="✅" local failure="🚫" local info="🔎" local rule="=" local horizontalRule="$(seq ${COLUMNS:-30} \| xargs printf "$rule%.0s")" local miniRule="$(seq 5 \| xargs printf "$rule%.0s")" local curlVersion="$(curl --version \| head -1 \| cut -d' ' -f2)" local curlVersionRequired=7.49 local edgeCount="$(wc -w <<< "$edges" \| tr -d ' ')" local cnameExists="" local endToEndTestSucceeded="" for region in IRL1 IND1 SIN OR SYD VA TYO; do local currShard="${region}-${poolDomain}" local curlResult="$(curl -vsm20 --connect-to "$hostname:443:$currShard:443" "$url" 2>&1)" if grep -q "$curlValidation" <<< "$curlResult"; then shardsFound+=" $currShard" if grep -q "$curlResponseValidation" <<< "$curlResult"; then shardsFoundCount=$((shardsFoundCount+1)) shardsFoundOutput+="\n\n$miniRule $success $hostname [edge shard: $currShard] $miniRule\n" else shardsFoundOutput+="\n\n$miniRule $failure $hostname [edge shard: $currShard] $miniRule\n" fi shardsFoundOutput+="$(grep -E "$curlRegex" <<< "$curlResult" \| sort)" if ! grep -q "$curlResponseValidation" <<< "$curlResult"; then shardsFoundOutput+="\nERROR: unexpected HTTP response from this shard using $url" fi fi done echo echo "$horizontalRule" echo echo "$service validation for hostname $hostname:" local dnsOutput="$(dig -t CNAME +short "$hostname" 2>&1)" if grep -qFi ".$edgeDomain" <<< "$dnsOutput"; then echo "$success $hostname passes DNS CNAME validation" cnameExists=true else echo -n "$failure $hostname FAILED DNS CNAME validation -- " if [ -n "$dnsOutput" ]; then echo -e "$dnsOutput is not in the subdomain $edgeDomain" else echo "required DNS CNAME record pointing to <target-client-code>.$edgeDomain not found" fi fi for region in IRL1 IND1 SIN OR SYD VA TYO; do local curlResult="$(curl -vsm20 --connect-to "$hostname:443:${region}-pool.data.adobedc.net:443" "https://$hostname$curlEndpoint" 2>&1)" if grep -q "$curlValidation" <<< "$curlResult"; then if grep -q "$curlResponseValidation" <<< "$curlResult"; then echo -en "$success $hostname passes TLS and HTTP response validation for region $region" if [ -n "$cnameExists" ]; then echo else echo " -- the DNS CNAME is not pointing to the correct subdomain for ${service}s with Adobe-managed certificates" \ "(bring-your-own-certificate implementations don't have this requirement), but this test passes as configured" fi endToEndTestSucceeded=true else echo -n "$failure $hostname FAILED HTTP response validation for region $region --" \ "unexpected response from $url -- " if [ -n "$cnameExists" ]; then echo "DNS is NOT pointing to the correct shard, notify Adobe Client Care" else echo "the required DNS CNAME record is missing, see above" fi fi else echo -n "$failure $hostname FAILED TLS validation for region $region -- " if [ -n "$cnameExists" ]; then echo "DNS is likely NOT pointing to the correct shard or there's a validation issue with the certificate or" \ "protocols, see curl output below and optionally SSL Shopper ($sslShopperUrl):" echo "" echo "$horizontalRule" echo "$curlResult" \| sed 's/^/ /g' echo "$horizontalRule" echo "" else echo "the required DNS CNAME record is missing, see above" fi fi done if [ "$shardsFoundCount" -ge "$edgeCount" ]; then echo -n "$success $hostname passes shard validation for the following $shardsFoundCount edge shards:" echo -e "$shardsFoundOutput" echo if [ -n "$cnameExists" ] && [ -n "$endToEndTestSucceeded" ]; then echo "$horizontalRule" echo "" echo " For additional TLS/SSL validation, see SSL Shopper:" echo "" echo " $info $sslShopperUrl" echo "" echo " To check DNS propagation around the world, see whatsmydns.net:" echo "" echo " $info DNS A records: https://whatsmydns.net/#A/$hostname" echo " $info DNS CNAME record: https://whatsmydns.net/#CNAME/$hostname" fi else echo -n "$failure $hostname FAILED shard validation -- shards found: $shardsFoundCount," \ "expected: $edgeCount" echo "" fi echo echo "$horizontalRule" echo }

function adobeTargetCnameValidation {
  local hostname="$1"

  if [ -z "$hostname" ]; then
    echo "ERROR: no hostname specified"
    return 1
  fi

  local service="Adobe Target CNAME implementation"
  local edges="41 42 44 45 46 47 48"
  local edgeDomain="tt.omtrdc.net"
  local edgeFormat="mboxedge%d%s.$edgeDomain"
  local poolDomain="pool.data.adobedc.net"
  local shards=5
  local shardsFoundCount=0
  local shardsFound=""
  local shardsFoundOutput=""
  local curlRegex="subject:.*CN=|expire date:|issuer:"
  local curlValidation="SSL certificate verify ok"
  local curlResponseValidation='"OK"'
  local curlEndpoint="/uptime?mboxClient=uptime3"
  local url="https://$hostname$curlEndpoint"
  local sslShopperUrl="https://www.sslshopper.com/ssl-checker.html#hostname=$hostname"
  local success="✅"
  local failure="🚫"
  local info="🔎"
  local rule="="
  local horizontalRule="$(seq ${COLUMNS:-30} | xargs printf "$rule%.0s")"
  local miniRule="$(seq 5 | xargs printf "$rule%.0s")"
  local curlVersion="$(curl --version | head -1 | cut -d' ' -f2)"
  local curlVersionRequired=7.49
  local edgeCount="$(wc -w <<< "$edges" | tr -d ' ')"
  local cnameExists=""
  local endToEndTestSucceeded=""

  for region in IRL1 IND1 SIN OR SYD VA TYO; do
    local currShard="${region}-${poolDomain}"
    local curlResult="$(curl -vsm20 --connect-to "$hostname:443:$currShard:443" "$url" 2>&1)"

    if grep -q "$curlValidation" <<< "$curlResult"; then
      shardsFound+=" $currShard"

      if grep -q "$curlResponseValidation" <<< "$curlResult"; then
        shardsFoundCount=$((shardsFoundCount+1))
        shardsFoundOutput+="\n\n$miniRule $success $hostname [edge shard: $currShard] $miniRule\n"
      else
        shardsFoundOutput+="\n\n$miniRule $failure $hostname [edge shard: $currShard] $miniRule\n"
      fi

      shardsFoundOutput+="$(grep -E "$curlRegex" <<< "$curlResult" | sort)"

      if ! grep -q "$curlResponseValidation" <<< "$curlResult"; then
        shardsFoundOutput+="\nERROR: unexpected HTTP response from this shard using $url"
      fi
    fi
  done

  echo
  echo "$horizontalRule"
  echo
  echo "$service validation for hostname $hostname:"

  local dnsOutput="$(dig -t CNAME +short "$hostname" 2>&1)"
  if grep -qFi ".$edgeDomain" <<< "$dnsOutput"; then
    echo "$success $hostname passes DNS CNAME validation"
    cnameExists=true
  else
    echo -n "$failure $hostname FAILED DNS CNAME validation -- "
    if [ -n "$dnsOutput" ]; then
      echo -e "$dnsOutput is not in the subdomain $edgeDomain"
    else
      echo "required DNS CNAME record pointing to <target-client-code>.$edgeDomain not found"
    fi
  fi

  for region in IRL1 IND1 SIN OR SYD VA TYO; do
    local curlResult="$(curl -vsm20 --connect-to "$hostname:443:${region}-pool.data.adobedc.net:443" "https://$hostname$curlEndpoint" 2>&1)"

    if grep -q "$curlValidation" <<< "$curlResult"; then
      if grep -q "$curlResponseValidation" <<< "$curlResult"; then
        echo -en "$success $hostname passes TLS and HTTP response validation for region $region"
        if [ -n "$cnameExists" ]; then
          echo
        else
          echo " -- the DNS CNAME is not pointing to the correct subdomain for ${service}s with Adobe-managed certificates" \
            "(bring-your-own-certificate implementations don't have this requirement), but this test passes as configured"
        fi
        endToEndTestSucceeded=true
      else
        echo -n "$failure $hostname FAILED HTTP response validation for region $region --" \
          "unexpected response from $url -- "
        if [ -n "$cnameExists" ]; then
          echo "DNS is NOT pointing to the correct shard, notify Adobe Client Care"
        else
          echo "the required DNS CNAME record is missing, see above"
        fi
      fi
    else
      echo -n "$failure $hostname FAILED TLS validation for region $region -- "
      if [ -n "$cnameExists" ]; then
        echo "DNS is likely NOT pointing to the correct shard or there's a validation issue with the certificate or" \
          "protocols, see curl output below and optionally SSL Shopper ($sslShopperUrl):"
        echo ""
        echo "$horizontalRule"
        echo "$curlResult" | sed 's/^/    /g'
        echo "$horizontalRule"
        echo ""
      else
        echo "the required DNS CNAME record is missing, see above"
      fi
    fi
  done

  if [ "$shardsFoundCount" -ge "$edgeCount" ]; then
    echo -n "$success $hostname passes shard validation for the following $shardsFoundCount edge shards:"
    echo -e "$shardsFoundOutput"
    echo

    if [ -n "$cnameExists" ] && [ -n "$endToEndTestSucceeded" ]; then
      echo "$horizontalRule"
      echo ""
      echo "  For additional TLS/SSL validation, see SSL Shopper:"
      echo ""
      echo "    $info  $sslShopperUrl"
      echo ""
      echo "  To check DNS propagation around the world, see whatsmydns.net:"
      echo ""
      echo "    $info  DNS A records:     https://whatsmydns.net/#A/$hostname"
      echo "    $info  DNS CNAME record:  https://whatsmydns.net/#CNAME/$hostname"
    fi
  else
    echo -n "$failure $hostname FAILED shard validation -- shards found: $shardsFoundCount," \
      "expected: $edgeCount"
    echo ""
  fi

  echo
  echo "$horizontalRule"
  echo
}

貼上此命令（將target.example.com取代為您的主機名稱）：

code language-none
`adobeTargetCnameValidation target.example.com`

如果實作準備就緒，您會看到如下所示的輸出。重要的一點是，所有驗證狀態行都顯示✅而非🚫。每個Target Edge CNAME分片都應該顯示CN=target.example.com，這符合要求的憑證上的主要主機名稱（憑證上的其他SAN主機名稱不會列印在此輸出中）。

code language-none

code language-none
$ adobeTargetCnameValidation target.example.com ========================================================== Adobe Target CNAME implementation validation for hostname target.example.com: ✅ target.example.com passes DNS CNAME validation ✅ target.example.com passes TLS and HTTP response validation for region IRL1 ✅ target.example.com passes TLS and HTTP response validation for region IND1 ✅ target.example.com passes TLS and HTTP response validation for region SIN ✅ target.example.com passes TLS and HTTP response validation for region OR ✅ target.example.com passes TLS and HTTP response validation for region SYD ✅ target.example.com passes TLS and HTTP response validation for region VA ✅ target.example.com passes TLS and HTTP response validation for region TYO ✅ target.example.com passes shard validation for the following 7 edge shards: ===== ✅ target.example.com [edge shard: IRL1-pool.data.adobedc.net] ===== * expire date: Feb 20 23:59:59 2026 GMT * issuer: C=US; O=DigiCert Inc; CN=DigiCert Global G2 TLS RSA SHA256 2020 CA1 * subject: C=US; ST=California; L=San Jose; O=Adobe Systems Incorporated; CN=target.example.com ===== ✅ target.example.com [edge shard: IND1-pool.data.adobedc.net] ===== * expire date: Feb 20 23:59:59 2026 GMT * issuer: C=US; O=DigiCert Inc; CN=DigiCert Global G2 TLS RSA SHA256 2020 CA1 * subject: C=US; ST=California; L=San Jose; O=Adobe Systems Incorporated; CN=target.example.com ===== ✅ target.example.com [edge shard: SIN-pool.data.adobedc.net] ===== * expire date: Feb 20 23:59:59 2026 GMT * issuer: C=US; O=DigiCert Inc; CN=DigiCert Global G2 TLS RSA SHA256 2020 CA1 * subject: C=US; ST=California; L=San Jose; O=Adobe Systems Incorporated; CN=target.example.com ===== ✅ target.example.com [edge shard: OR-pool.data.adobedc.net] ===== * expire date: Feb 20 23:59:59 2026 GMT * issuer: C=US; O=DigiCert Inc; CN=DigiCert Global G2 TLS RSA SHA256 2020 CA1 * subject: C=US; ST=California; L=San Jose; O=Adobe Systems Incorporated; CN=target.example.com ===== ✅ target.example.com [edge shard: SYD-pool.data.adobedc.net] ===== * expire date: Feb 20 23:59:59 2026 GMT * issuer: C=US; O=DigiCert Inc; CN=DigiCert Global G2 TLS RSA SHA256 2020 CA1 * subject: C=US; ST=California; L=San Jose; O=Adobe Systems Incorporated; CN=target.example.com ===== ✅ target.example.com [edge shard: VA-pool.data.adobedc.net] ===== * expire date: Feb 20 23:59:59 2026 GMT * issuer: C=US; O=DigiCert Inc; CN=DigiCert Global G2 TLS RSA SHA256 2020 CA1 * subject: C=US; ST=California; L=San Jose; O=Adobe Systems Incorporated; CN=target.example.com ===== ✅ target.example.com [edge shard: TYO-pool.data.adobedc.net] ===== * expire date: Feb 20 23:59:59 2026 GMT * issuer: C=US; O=DigiCert Inc; CN=DigiCert Global G2 TLS RSA SHA256 2020 CA1 * subject: C=US; ST=California; L=San Jose; O=Adobe Systems Incorporated; CN=target.example.com ========================================================== For additional TLS/SSL validation, see SSL Shopper: 🔎 https://www.sslshopper.com/ssl-checker.html#hostname=target.example.com To check DNS propagation around the world, see whatsmydns.net: 🔎 DNS A records: https://whatsmydns.net/#A/target.example.com 🔎 DNS CNAME record: https://whatsmydns.net/#CNAME/target.example.com

$ adobeTargetCnameValidation target.example.com

==========================================================

Adobe Target CNAME implementation validation for hostname target.example.com:
✅ target.example.com passes DNS CNAME validation
✅ target.example.com passes TLS and HTTP response validation for region IRL1
✅ target.example.com passes TLS and HTTP response validation for region IND1
✅ target.example.com passes TLS and HTTP response validation for region SIN
✅ target.example.com passes TLS and HTTP response validation for region OR
✅ target.example.com passes TLS and HTTP response validation for region SYD
✅ target.example.com passes TLS and HTTP response validation for region VA
✅ target.example.com passes TLS and HTTP response validation for region TYO
✅ target.example.com passes shard validation for the following 7 edge shards:

===== ✅ target.example.com [edge shard: IRL1-pool.data.adobedc.net] =====
*  expire date: Feb 20 23:59:59 2026 GMT
*  issuer: C=US; O=DigiCert Inc; CN=DigiCert Global G2 TLS RSA SHA256 2020 CA1
*  subject: C=US; ST=California; L=San Jose; O=Adobe Systems Incorporated; CN=target.example.com

===== ✅ target.example.com [edge shard: IND1-pool.data.adobedc.net] =====
*  expire date: Feb 20 23:59:59 2026 GMT
*  issuer: C=US; O=DigiCert Inc; CN=DigiCert Global G2 TLS RSA SHA256 2020 CA1
*  subject: C=US; ST=California; L=San Jose; O=Adobe Systems Incorporated; CN=target.example.com

===== ✅ target.example.com [edge shard: SIN-pool.data.adobedc.net] =====
*  expire date: Feb 20 23:59:59 2026 GMT
*  issuer: C=US; O=DigiCert Inc; CN=DigiCert Global G2 TLS RSA SHA256 2020 CA1
*  subject: C=US; ST=California; L=San Jose; O=Adobe Systems Incorporated; CN=target.example.com

===== ✅ target.example.com [edge shard: OR-pool.data.adobedc.net] =====
*  expire date: Feb 20 23:59:59 2026 GMT
*  issuer: C=US; O=DigiCert Inc; CN=DigiCert Global G2 TLS RSA SHA256 2020 CA1
*  subject: C=US; ST=California; L=San Jose; O=Adobe Systems Incorporated; CN=target.example.com

===== ✅ target.example.com [edge shard: SYD-pool.data.adobedc.net] =====
*  expire date: Feb 20 23:59:59 2026 GMT
*  issuer: C=US; O=DigiCert Inc; CN=DigiCert Global G2 TLS RSA SHA256 2020 CA1
*  subject: C=US; ST=California; L=San Jose; O=Adobe Systems Incorporated; CN=target.example.com

===== ✅ target.example.com [edge shard: VA-pool.data.adobedc.net] =====
*  expire date: Feb 20 23:59:59 2026 GMT
*  issuer: C=US; O=DigiCert Inc; CN=DigiCert Global G2 TLS RSA SHA256 2020 CA1
*  subject: C=US; ST=California; L=San Jose; O=Adobe Systems Incorporated; CN=target.example.com

===== ✅ target.example.com [edge shard: TYO-pool.data.adobedc.net] =====
*  expire date: Feb 20 23:59:59 2026 GMT
*  issuer: C=US; O=DigiCert Inc; CN=DigiCert Global G2 TLS RSA SHA256 2020 CA1
*  subject: C=US; ST=California; L=San Jose; O=Adobe Systems Incorporated; CN=target.example.com

==========================================================

For additional TLS/SSL validation, see SSL Shopper:

    🔎  https://www.sslshopper.com/ssl-checker.html#hostname=target.example.com

To check DNS propagation around the world, see whatsmydns.net:

    🔎  DNS A records:     https://whatsmydns.net/#A/target.example.com
    🔎  DNS CNAME record:  https://whatsmydns.net/#CNAME/target.example.com

NOTE

如果此驗證命令在DNS驗證時失敗，但您已進行必要的DNS變更，則可能需要等待DNS更新完全傳播。 DNS記錄具有相關的TTL （存留時間），它指定這些記錄的DNS回覆的快取到期時間。因此，您可能需要至少等待TTL的時間。您可以使用dig target.example.com命令或G Suite Toolbox來查詢您特定的TTL。若要檢查全球的DNS傳播，請參閱whatsmydns.net。

如何使用具有 CNAME 的退出連結

如果您使用CNAME，選擇退出連結應該包含「client=clientcode引數，例如：
https://my.cname.domain/optout?client=clientcode。

將clientcode取代為您的使用者端代碼，然後新增要連結至選擇退出URL的文字或影像。

已知限制

有CNAME和at.js 1.x時，QA模式沒有粘性，因為它是以協力廠商Cookie為基礎。因應措施是將預覽引數新增到您導覽到的每個URL中。有CNAME和at.js 2.x時，QA模式會很粘滯。
使用CNAME時，Target呼叫的Cookie標頭大小更有可能增加。 Adobe建議將Cookie大小維持在8 KB以下。

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