HP HPE6-A85日本語問題集で100%カバー率リアル試験問題（更新された62問あります)
リアルHPE6-A85日本語問題集でリアルHP問題集PDF
質問 # 31
WPA3-Personal は、ステーションがワイヤレス ネットワークに接続するたびに異なるペアワイズ マスター キー (PMK) を生成するソースとして何を使用しますか?
- A. 日和見無線暗号化 (OWE)
- B. セッション固有の情報 (MAC および nonce)
- C. 同等者同時認証 (SAE)
- D. キー暗号化キー (KEK)
正解：B
解説：
Explanation
The source that WPA3-Personal uses to generate a different Pairwise Master Key (PMK) each time a station connects to the wireless network is session-specific information (MACs and nonces). WPA3-Personal uses Simultaneous Authentication of Equals (SAE) to replace PSK authentication in WPA2-Personal. SAE is a secure key establishment protocol that uses a Diffie-Hellman key exchange to derive a shared secret between two parties without revealing it to an eavesdropper. SAE involves the following steps:
The station and the access point exchange Commit messages that contain their MAC addresses and random numbers called nonces.
The station and the access point use their own passwords and the received MAC addresses and nonces to calculate a shared secret called SAE Password Element (PE).
The station and the access point use their own PE and the received MAC addresses and nonces to calculate a shared secret called SAE Key Seed (KS).
The station and the access point use their own KS and the received MAC addresses and nonces to calculate a shared secret called SAE Key Confirmation Key (KCK).
The station and the access point use their own KCK and the received MAC addresses and nonces to calculate a confirmation value called SAE Confirm.
The station and the access point exchange Confirm messages that contain their SAE Confirm values.
The station and the access point verify that the received SAE Confirm values match their own calculated values. If they match, the authentication is successful and the station and the access point have established a shared secret called SAE PMK.
The SAE PMK is different for each session because it depends on the MAC addresses and nonces that are exchanged in each authentication process. The SAE PMK is used as an input for the 4-way handshake that generates the Pairwise Temporal Key (PTK) for encrypting data frames.
The other options are not sources that WPA3-Personal uses to generate a different PMK each time a station connects to the wireless network because:
Opportunistic Wireless Encryption (OWE): OWE is a feature that provides encryption for open networks without requiring authentication or passwords. OWE uses a similar key establishment protocol as SAE, but it does not generate a PMK. Instead, it generates a Pairwise Secret (PS) that is used as an input for the 4-way handshake that generates the PTK.
Simultaneous Authentication of Equals (SAE): SAE is not a source, but a protocol that uses session-specific information as a source to generate a different PMK each time a station connects to the wireless network.
Key Encryption Key (KEK): KEK is not a source, but an output of the 4-way handshake that generates the PTK. KEK is used to encrypt group keys that are distributed by the access point.
References: https://www.wi-fi.org/discover-wi-fi/wi-fi-certified-6e
https://www.wi-fi.org/file/wi-fi-alliance-unlicensed-spectrum-in-the-us
https://www.cisco.com/c/en/us/products/collateral/wireless/catalyst-9100ax-access-points/wpa3-dep-guide-og.ht
https://info.support.huawei.com/info-finder/encyclopedia/en/WPA3.html
https://rp.os3.nl/2019-2020/p99/presentation.pdf
質問 # 32
ネットワーク技術者が 802 1X 経由で従業員 SSID に正常に接続しました。接続を成功させるにはどの RADIUS メッセージを探す必要がありますか?
- A. 成功
- B. アクセス許可
- C. 許可されています
- D. 認証済み
正解：B
解説：
Explanation
The RADIUS message that you should look for to ensure a successful connection via 802.1X is Access-Accept. This message indicates that the RADIUS server has authenticated and authorized the supplicant (the device that wants to access thenetwork) and has granted it access to the network resources. The Access-Accept message may also contain additional attributes such as VLAN ID, session timeout, or filter ID that specify how the authenticator (the device that controls access to the network, such as a switch) should treat the supplicant's traffic.
The other options are not RADIUS messages because:
Authorized: This is not a RADIUS message, but a state that indicates that a port on an authenticator is allowed to pass traffic from a supplicant after successful authentication and authorization.
Success: This is not a RADIUS message, but a status that indicates that an EAP Extensible Authentication Protocol (EAP) is an authentication framework that provides support for multiple authentication methods, such as passwords, certificates, tokens, or biometrics. EAP is used in wireless networks and point-to-point connections to provide secure authentication between a supplicant (a device that wants to access the network) and an authentication server (a device that verifies the credentials of the supplicant). exchange has completed successfully between a supplicant and an authentication server.
Authenticated: This is not a RADIUS message, but a state that indicates that a port on an authenticator has received an EAP-Success message from an authentication server after successful authentication of a supplicant.
References: https://en.wikipedia.org/wiki/RADIUS#Access-Accept
https://www.cisco.com/c/en/us/support/docs/security-vpn/remote-authentication-dial-user-service-radius/13838-1
https://en.wikipedia.org/wiki/IEEE_802.1X#Port-based_network_access_control
https://en.wikipedia.org/wiki/Extensible_Authentication_Protocol#EAP_exchange
質問 # 33
Aruba のキャプティブ ポータルはどの認証を使用しますか?
- A. 802.1x 認証
- B. レイヤ 2 認証
- C. MAC認証
- D. レイヤー3認証
正解：D
解説：
Explanation
Aruba's Captive Portal uses Layer 3 authentication, which means that it intercepts the client's HTTP requests and redirects them to a web page where the client can enter their credentials. The credentials are then verified by a RADIUS server or a local database before granting network access.
References:https://www.arubanetworks.com/techdocs/Instant_86_WebHelp/Content/instant-ug/captive-portal/ca
質問 # 34
推奨される VSF トポロジは何ですか? (2つ選択してください。)
- A. フルメッシュ
- B. スター
- C. フルメッシュ+MAD
- D. リング
- E. デイジーチェーン+MAD
正解：D、E
解説：
Explanation
Only: Daisy chain plus MAD and ring are the recommended VSF topologies for Aruba switches. They provide high availability and redundancy for the VSF stack. MAD (Multiple Active Detection) is a mechanism to detect and resolve split-brain scenarios in a VSF stack.
References:https://www.arubanetworks.com/techdocs/AOS-CX/10.04/HTML/5200-6790/GUID-D6EF042E-EEE
質問 # 35
スパニングツリー (STP) 設定を備えた 2 つの独立した ArubaOS-CX 6300 スイッチが、ポート 1/1/1 と 1/1/2 の間で 2 本のケーブルで相互接続されています。 4 つのポートすべてに「no shutdown」および「no routing」コマンドがあります。 STP はどのように転送しますかそれともこれらのポート上のトラフィックを破棄しますか?
- A. MAC アドレスが小さいスイッチは 1 つのポートで廃棄し、MAC アドレスが大きいスイッチは両方のポートで転送します。
- B. MAC アドレスが小さいスイッチは両方のポートで転送し、MAC アドレスが大きいスイッチは両方のポートで転送します。
- C. MAC アドレスが小さいスイッチは両方のポートで転送し、MAC アドレスが大きいスイッチは 1 つのポートで廃棄します。
- D. MAC アドレスが小さいスイッチは 1 つのポートで廃棄し、MAC アドレスが大きいスイッチは 1 つのポートで廃棄します。
正解：D
解説：
Explanation
The way that STP Spanning Tree Protocol. STP is a network protocol that ensures a loop-free topology for any bridged Ethernet local area network by preventing redundant paths between switches or bridges from creating loops that cause broadcast storms, multiple frame transmission, and MAC table instability. STP creates a logical tree structure that spans all of the switches in an extended network and blocks any redundant links that are not part of the tree from forwarding data packets . will forward or discard traffic on these ports is as follows:
STP will elect a root bridge among the two switches based on their bridge IDs, which are composed of a priority value and a MAC address. The switch with the lower bridge ID will become the root bridge and will forward traffic on all its ports.
STP will assign a role and a state to each port on both switches based on their port IDs, which are composed of a priority value and a port number. The port with the lower port ID will become the designated port and will forward traffic, while the port with the higher port ID will become the alternate port and will discard traffic.
In this scenario, since both switches have two cables connected between ports 1/1/1 and 1/1/2, there will be two possible paths between them, creating a loop. To prevent this loop, STP will block one of these paths by discarding traffic on one of the ports on each switch.
Assuming that both switches have the same priority value (default is 32768), the switch with the lower MAC address will have the lower bridge ID and will become the root bridge. The root bridge will forward traffic on both ports 1/1/1 and 1/1/2.
Assuming that both ports have the same priority value (default is 128), port 1/1/1 will have a lower port ID than port 1/1/2 on both switches because it has a lower port number. Port 1/1/1 will become the designated port and will forward traffic, while port 1/1/2 will become the alternate port and will discard traffic.
Therefore, the switch with the lower MAC address will discard traffic on one port (port 1/1/2), while the switch with the higher MAC address will also discard traffic on one port (port 1/1/2).
References: 3 https://en.wikipedia.org/wiki/Spanning_Tree_Protocol
質問 # 36
TCP 3ウェイ ハンドシェイク シーケンスの正しい順序は何ですか?
正解：
解説：
Explanation
TCP 3-Way Handshake sequence is:
Step 1: The initiating host sends a packet with no data to the target host with a SEQ=1 and sets the SYN flag to 1.
Step 2: The target host responds with a packet with ACK=2, SEQ=8, and the SYN and ACK flags set to
1.
Step 3: The initiating host sends a packet with SEQ=2, ACK=9, and the ACK flag set to 1.
Step 4: A normal-controlled connection is established.
References: https://en.wikipedia.org/wiki/Transmission_Control_Protocol
https://www.cisco.com/c/en/us/support/docs/ip/routing-information-protocol-rip/13788-3.html
質問 # 37
AruDaCX 8400 の「snow ip Route」出力に基づきます。ルートのタイプは「10.1 20 0/24、VRF デフォルト経由」です。
10.1.12.2。[1/0]」?
- A. ローカル
- B. OSPF
- C. 接続されています
- D. static
正解：D
解説：
Explanation
A static route is a route that is manually configured on a router or switch and does not change unless it is modified by an administrator. Static routes are used to specify how traffic should reach specific destinations that are not directly connected to the device or that are not reachable by dynamic routing protocols. In Aruba CX switches, static routes can be configured using the ip route command in global configuration mode. Based on the "show ip route" output on an Aruba CX 8400 switch, the route "10.1 20 0/24, vrf default via 10.1.12.2,
[1/0]" is a static route because it has an administrative distance of 1 and a metric of 0, which are typical values for static routes. References: https://en.wikipedia.org/wiki/Static_routing
https://www.arubanetworks.com/techdocs/AOS-CX_10_04/NOSCG/Content/cx-noscg/ip-routing/static-routes.h
質問 # 38
SVI を使用した ln バンド管理が使用されている場合、Aruba CX スイッチでデフォルト ルートを 10.4.5.1 に設定するにはどのコマンドが使用されますか?
- A. iP デフォルトゲートウェイ 10.4.5.1
- B. ip ルート 0.0 0 0/0 10.4.5.1
- C. ip ルート 0 0 0.070 10.4 5.1 vrf 管理
- D. デフォルトゲートウェイ 10.4.5.1
正解：B
解説：
Explanation
The command that is used to set a default route to 10.4.5.1 on an Aruba CX switch when in-band management using an SVI is being used is ip route 0.0 0 0/0 10.4.5.1 . This command specifies the destination network address (0.0 0 0) and prefix length (/0) and the next-hop address (10.4.5.1) for reaching any network that is not directly connected to the switch. The default route applies to the default VRF Virtual Routing and Forwarding.
VRF is a technology that allows multiple instances of a routing table to co-exist within the same router at the same time. VRFs are typically used to segment network traffic for security, privacy, or administrative purposes. , which is used for in-band management traffic that goes through an SVI Switch Virtual Interface.
SVI is a virtual interface on a switch that allows the switch to route packets between different VLANs on the same switch or different switches that are connected by a trunk link. An SVI is associated with a VLAN and has an IP address and subnet mask assigned to it
https://www.arubanetworks.com/techdocs/AOS-CX/10_08/HTML/ip_route_4100i-6000-6100-6200/Content/Ch
2
https://www.arubanetworks.com/techdocs/AOS-CX/10_08/HTML/ip_route_4100i-6000-6100-6200/Content/Ch
質問 # 39
展示を参照してください。
指定されたトポロジでは、Aruba CX 8325 スイッチのペアが、アクティブ ゲートウェイを使用する VSX スタック内にあります。クライアントが VSX をデフォルト ゲートウェイとして使用してアクセス スイッチに接続されている場合、VSX ペアの仮想 IP の性質と動作は何ですか?
- A. 仮想 IP は両方の CX スイッチでアクティブです
- B. 仮想 IP は VSX と同期された SVI IP アドレスを使用します
- C. 仮想 IP はプライマリ VSX スイッチでアクティブです
仮想フローティング IP は障害が発生した場合にフェイルオーバーします。
正解：C
解説：
Explanation
Virtual Switching Extension (VSX) is a feature that allows two Aruba CX switches to operate as a single logical device with a single control plane and data plane. VSX provides high availability, scalability, and simplified management for campus and data center networks3. In VSX, one switch is designated as the primary switch and the other as the secondary switch. The primary switch owns and responds to ARP Address Resolution Protocol. ARP is a communication protocol used for discovering the link layer address, such as a MAC address, associated with a given internet layer address, typically an IPv4 address. This mapping is a critical function in the Internet protocol suite. requests for the virtual IP address of the VSX pair4. The virtual IP address is used as the default gateway for clients connected to the access switch. If the primary switch fails, the secondary switch takes over the virtual IP address and continues to forward traffic for the clients5.
References: 3
https://www.arubanetworks.com/techdocs/AOS-CX_10_04/UG/Content/cx-ug/vsx/vsx-overview.htm 4
https://www.arubanetworks.com/techdocs/AOS-CX_10_04/UG/Content/cx-ug/vsx/vsx-ip-addressing.htm 5
https://www.arubanetworks.com/techdocs/AOS-CX_10_04/UG/Content/cx-ug/vsx/vsx-failover.htm
質問 # 40
お客様には、Windows 10 クライアントを使用するユーザーの承認ポリシーを作成するという要件があり、Tor が 1 つの Radius セッション内でデバイスとユーザーの資格情報の両方を承認するという要件があります。
要件に対する正しい解決策は何でしょうか?
- A. ClearPass 6.9 と PEAP
- B. ClearPass 6.9 (EAP-TLS あり)
- C. ClearPass 6.9 (EAP-TEAP あり)
- D. ClearPass 6.9 (EAP-TTLS あり)
正解：C
解説：
Explanation
EAP-TEAP is a tunnel-based authentication method that supports both device and user authentication within a single RADIUS session. ClearPass 6.9 supports EAP-TEAP as anauthentication method for Windows 10 clients. References:
https://www.arubanetworks.com/techdocs/ClearPass/6.9/Guest/Content/CPPM_UserGuide/EAP-TEAP/EAP-TE
質問 # 41
Aruba スタンドアロン AP を使用する場合、クライアント VLAN 割り当てに「ネイティブ VLAN」を選択します。クライアント IP はどのサブネットに存在しますか?
- A. アクセスポイントと同じサブネット
- B. Aruba ESP ゲートウェイと同じサブネット
- C. モビリティ コンダクターと同じサブネット
- D. モビリティ コントローラーと同じサブネット
正解：A
解説：
Explanation
When using an Aruba standalone AP, selecting "Native VLAN" for the Client VLAN Assignment means that the clients will get their IP addresses from the same subnet as the access point's IP address. This is because the access point acts as a DHCP server for the clients in this mode.
References:https://www.arubanetworks.com/techdocs/Instant_86_WebHelp/Content/instant-ug/iap-dhcp/iap-dhc
質問 # 42
顧客は、全社的なグループ ベース ポリシー (GPO) を介してユーザー証明書とデバイス証明書を実装しました。ネットワークへの認証時にクライアント証明書が必要な EAP 方法はどれですか?
- A. EAP-TEAP
- B. EAP-TTLS
- C. PEAP
- D. EAP-TLS
正解：D
解説：
Explanation
EAP-TLS is an authentication method that requires client certificates when authenticating to the network. It provides mutual authentication between the client and the server using public key cryptography and digital certificates.
References:https://www.arubanetworks.com/techdocs/ClearPass/6.9/Guest/Content/CPPM_UserGuide/EAP-TLS
質問 # 43
ArubaOS-CX スイッチへの入力で過剰なブロードキャスト トラフィックをドロップする必要があります。このタスクに使用する最適なテクノロジは何ですか?
- A. QoS シェーピング
- B. レート制限
- C. 厳密なキューイング
- D. DWRR キューイング
正解：B
解説：
Explanation
The best technology to use for dropping excessive broadcast traffic on ingress to an ArubaOS-CX switch is rate limiting. Rate limiting is a feature that allows network administrators to control the amount of traffic that enters or leaves a port or a VLAN on a switch by setting bandwidth thresholds or limits. Rate limiting can be used to prevent network congestion, improve network performance, enforce service level agreements(SLAs), or mitigate denial-of-service (DoS) attacks. Rate limiting can be applied to broadcast traffic on ingress to an ArubaOS-CX switch by using the storm-control command in interface configuration mode. This command allows network administrators to specify the percentage of bandwidth or packets per second that can be used by broadcast traffic on an ingress port. If the broadcast traffic exceeds the specified threshold, the switch will drop the excess packets.
The other options are not technologies for dropping excessive broadcast traffic on ingress because:
DWRR queuing: DWRR stands for Deficit Weighted Round Robin, which is a queuing algorithm that assigns different weights or priorities to different traffic classes or queues on an egress port. DWRR ensures that each queue gets its fair share of bandwidth based on its weight while avoiding starvation of lower priority queues. DWRR does not drop excessive broadcast traffic on ingress, but rather schedules outgoing traffic on egress.
QoS shaping: QoS stands for Quality of Service, which is a set of techniques that manage network resources and provide different levels of service to different types of traffic based on their requirements.
QoS shaping is a technique that delays or buffers outgoing traffic on an egress port to match the available bandwidth or rate limit. QoS shaping does not drop excessive broadcast traffic on ingress, but rather smooths outgoing traffic on egress.
Strict queuing: Strict queuing is another queuing algorithm that assigns different priorities to different traffic classes or queues on an egress port. Strict queuing ensures that higher priority queues are always served before lower priority queues regardless of their bandwidth requirements or weights. Strict queuing does not drop excessive broadcast traffic on ingress, but rather schedules outgoing traffic on egress.
References: https://en.wikipedia.org/wiki/Rate_limiting
https://www.arubanetworks.com/techdocs/AOS-CX_10_08/NOSCG/Content/cx-noscg/qos/storm-control.htm
https://www.arubanetworks.com/techdocs/AOS-CX_10_08/NOSCG/Content/cx-noscg/qos/dwrr.htm
https://www.arubanetworks.com/techdocs/AOS-CX_10_08/NOSCG/Content/cx-noscg/qos/shaping.htm
https://www.arubanetworks.com/techdocs/AOS-CX_10_08/NOSCG/Content/cx-noscg/qos/strict.htm
質問 # 44
6 GHz 帯域の主な特徴は何ですか?
- A. 北米では、6 GHz 帯域は、北米の 40 MHz チャネルよりも多くの 80 MHz チャネルを提供します。
5GHz帯。 - B. 低電力デバイスは屋内および屋外での使用が許可されています。
- C. 6 GHz 帯域は既存の帯域と完全に下位互換性があります。
- D. 6 GHz WLAN では、物体による RF 信号の吸収が少なくなります。
正解：A
解説：
Explanation
The main characteristic of the 6 GHz band that is true among the given options is that in North America, the 6 GHz band offers more 80 MHz channels than there are 40 MHz channels in the 5 GHz band. This characteristic provides more spectrum availability, less interference, and higher throughput for wireless devices that support Wi-Fi 6E Wi-Fi Enhanced (Wi-Fi 6E) is an extension of Wi-Fi 6 (802.11ax) standard that operates in the newly available unlicensed frequency spectrum around 6 GHz in addition to existing bands below it. Some facts about this characteristic are:
In North America, there are up to seven non-overlapping channels available in each of three channel widths (20 MHz, 40 MHz, and 80 MHz) in the entire unlicensed portion of the new spectrum (5925-7125 MHz). This means there are up to 21 non-overlapping channels available for Wi-Fi devices in total.
In comparison, in North America, there are only nine non-overlapping channels available in each of two channel widths (20 MHz and 40 MHz) in the entire unlicensed portion of the existing spectrum below it (2400-2483 MHz and 5150-5825 MHz). This means there are only up to nine non-overlapping channels available for Wi-Fi devices in total.
Therefore, in North America, there are more than twice as many non-overlapping channels available in each channel width in the new spectrum than in the existing spectrum below it.
Specifically, there are more than twice as many non-overlapping channels available at 80 MHz width (seven) than at 40 MHz width (three) in the existing spectrum below it.
The other options are not true because:
Less RF signal is absorbed by objects in a 6 GHz WLAN: This option is false because higher frequency signals tend to be more absorbed by objects than lower frequency signals due to higher attenuation Attenuation is a general term that refers to any reduction in signal strength during transmission over distance or through an object or medium . Therefore, RF signals in a 6 GHz WLAN would be more absorbed by objects than RF signals in a lower frequency WLAN.
The 6 GHz band is fully backward compatible with existing bands: This option is false because Wi-Fi devices need to support Wi-Fi 6E standard to operate in the new spectrum around 6 GHz . Existing Wi-Fi devices that do not support Wi-Fi 6Estandard cannot use this spectrum and can only operate in existing bands below it.
Low Power Devices are allowed for indoor and outdoor usage: This option is false because Low Power Indoor Devices (LPI) are only allowed for indoor usage under certain power limits and registration requirements . Outdoor usage of LPI devices is prohibited by regulatory authorities such as FCC Federal Communications Commission (FCC) is an independent agency of United States government that regulates communications by radio, television, wire, satellite, and cable across United States . However, outdoor usage of Very Low Power Devices (VLP) may be allowed under certain power limits and without registration requirements.
References: https://www.wi-fi.org/discover-wi-fi/wi-fi-certified-6e
https://www.wi-fi.org/file/wi-fi-alliance-spectrum-needs-study
https://www.cisco.com/c/en/us/products/collateral/wireless/spectrum-expert-wi-fi/prod_white_paper0900aecd80
https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/82068-power-levels.html
https://www.wi-fi.org/file/wi-fi-alliance-unlicensed-spectrum-in-the-us
質問 # 45
Aruba AP でライブ ファームウェア アップグレードを実行するとき。クライアントへの影響を最小限に抑えるために、RF 近隣データに基づいてすべての AP を分割するテクノロジーはどれですか?
- A. Aruba Ai の洞察
- B. Aruba ClientMatch
- C. Aruba ESP
- D. アルバ エアマッチ
正解：D
解説：
Explanation
Aruba AirMatch is a feature that optimizes RF Radio Frequency. RF is any frequency within the electromagnetic spectrum associated with radio wave propagation. When an RF current is supplied to an antenna, an electromagnetic field is created that then is able to propagate through space. performance and user experience by using machine learning algorithms and historical data to dynamically adjust AP power levels, channel assignments, and channel width. AirMatch performs live firmware upgrades on Aruba APs by partitioning all the APs based on RFneighborhood data and minimizing the impact on clients. AirMatch uses a rolling upgrade process that upgrades one partition at a time while ensuring that adjacent partitions are not upgraded simultaneously. References:
https://www.arubanetworks.com/assets/ds/DS_AirMatch.pdfhttps://www.arubanetworks.com/techdocs/ArubaOS
質問 # 46
適切な QoS 概念とその定義を一致させます。
正解：
解説：
Explanation
QoS Quality of Service (QoS) is a set of techniques that manage network resources and provide different levels of service to different types of traffic based on their requirements. QoS can improve network performance, reduce latency, increase throughput, and prevent congestion. concept and its definition. Here is my answer:
QoS Concept:
Best Effort Service
Class of Service
Differentiated Services
WMM ====================== Definition:
d) A method where traffic is treated equally in a first-come, first-served manner a) A method for classifying network traffic at Layer 2 by marking 802.1Q VLAN Ethernet frames with one of eight service classes b) A method for classifying network traffic at Layer 3 by marking packets with one of 64 different service classes c) A method for classifying network traffic using access categories based on the IEEE 802.11e QoS standard Short But Comprehensive Explanation of Correct Answer Only: The correct match between QoS concept and its definition is as follows:
Best Effort Service: This is a method where traffic is treated equally in a first-come, first-served manner without any prioritization or differentiation. This is the default service level for most networks and applications that do not have specific QoS requirements or guarantees. Best Effort Service does not provide any assurance of bandwidth, delay, jitter, or packet loss.
Class of Service: This is a method for classifying network traffic at Layer 2 by marking 802.1Q VLAN Ethernet frames with one of eight service classes (0 to 7). These service classes are also known as IEEE
802.1p priority values or PCP Priority Code Point (PCP) is a 3-bit field in the 802.1Q VLAN tag that indicates the priority level of an Ethernet frame . Class of Service allows network devices to identify and handle different types of traffic based on their priority levels. Class of Service is typically used in LAN Local Area Network (LAN) is a network that connects devices within a limited geographic area, such as a home, office, or building environments where Layer 2 switching is predominant.
Differentiated Services: This is a method for classifying network traffic at Layer 3 by marking packets with one of 64 different service classes (0 to 63). These service classes are also known as DiffServ Code Points (DSCP) DiffServ Code Point (DSCP) is a 6-bit field in the IP header that indicates the service class of a packet . Differentiated Services allows network devices to identify and handle different types of traffic based on their service classes. Differentiated Services is typically used in WAN Wide Area Network (WAN) is a network that connects devices across a large geographic area, such as a country or continent environments where Layer 3 routing is predominant.
WMM: This is a method for classifying network traffic using access categories based on the IEEE
802.11e QoS standard. WMM stands for Wi-Fi Multimedia and it is a certification program developed by the Wi-Fi Alliance to enhance QoS for wireless networks. WMM defines four access categories (AC): Voice, Video, Best Effort, and Background. These access categories correspond to different priority levels and contention parameters for wireless traffic. WMM allows wireless devices to identify and handle different types of traffic based on their access categories.
References: https://en.wikipedia.org/wiki/Quality_of_service
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_dfsrv/configuration/xe-16/qos-dfsrv-xe-16-book/qos-dfsr
https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/81831-qos-wlan.html
https://www.wi-fi.org/discover-wi-fi/wi-fi-certified-wmm
質問 # 47
UXl の 2 つの利点は何ですか? (2つ選択してください。)
- A. UX1 はクライアント/ユーザーのように動作します。
- B. UX1 は、HTTP VOIP や Office 365 などのさまざまなアプリケーションをチェックできます。
- C. UX1 は、指定された場所にあるすべての AP の Wi-Fi カバレッジを測定します。
- D. UXl はインターネット接続なしで使用できます
- E. UXl は、離れた場所で最適な WiFi チャネルを計算するのに役立ちます。
正解：A、B
解説：
Explanation
A UXI (User Experience Insight) is a device that simulates user behavior and tests network performance from the user perspective. It can check different applications, such as HTTP, VOIP, or Office 365, and measure metrics such as latency, jitter, packet loss, and throughput.
References:https://www.arubanetworks.com/products/networking/user-experience-insight/
質問 # 48
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