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NEW QUESTION: 1
Under which circumstance should a network administrator implement one-way NAT?
A. when traffic that originates inside the network must be routed to internal hosts
B. when traffic that originates outside the network must be routed to internal hosts
C. when the network must route UDP traffic
D. when the network has few public IP addresses and many private IP addresses require outside access
Answer: B
Explanation:
Explanation: NAT operation is typically transparent to both the internal and external hosts.
Typically the internal host is aware of the true IP address and TCP or UDP port of the external host. Typically the NAT device may function as the default gateway for the internal host. However the external host is only aware of the public IP address for the NAT device and the particular port being used to communicate on behalf of a specific internal host.
NAT and TCP/UDP
"Pure NAT", operating on IP alone, may or may not correctly parse protocols that are totally concerned with IP information, such as ICMP, depending on whether the payload is interpreted by a host on the "inside" or "outside" of translation. As soon as the protocol stack is traversed, even with such basic protocols as TCP and UDP, the protocols will break unless NAT takes action beyond the network layer.
IP packets have a checksum in each packet header, which provides error detection only for the header. IP datagrams may become fragmented and it is necessary for a NAT to reassemble these fragments to allow correct recalculation of higher-level checksums and correct tracking of which packets belong to which connection.
The major transport layer protocols, TCP and UDP, have a checksum that covers all the data they carry, as well as the TCP/UDP header, plus a "pseudo-header" that contains the source and destination IP addresses of the packet carrying the TCP/UDP header. For an originating NAT to pass TCP or UDP successfully, it must recompute the TCP/UDP header checksum based on the translated IP addresses, not the original ones, and put that checksum into the TCP/UDP header of the first packet of the fragmented set of packets.
The receiving NAT must recompute the IP checksum on every packet it passes to the destination host, and also recognize and recompute the TCP/UDP header using the retranslated addresses and pseudo-header. This is not a completely solved problem. One solution is for the receiving NAT to reassemble the entire segment and then recompute a checksum calculated across all packets.
The originating host may perform Maximum transmission unit (MTU) path discovery to determine the packet size that can be transmitted without fragmentation, and then set the don't fragment (DF) bit in the appropriate packet header field. Of course, this is only a one- way solution, because the responding host can send packets of any size, which may be fragmented before reaching the NAT.
NEW QUESTION: 2
財務部門のサイトコレクションの技術要件を満たす必要があります。
あなたは何をするべきか？
A. SharePoint管理センターから、財務部門のサイトコレクションを選択し、共有設定を構成します。
B. SharePoint管理センターから、[共有]を選択し、[ドメインを使用して外部共有を制限する]を選択します
C. Security 8t Compliance管理センターから、分類ラベルポリシーを作成します。
D. セキュリティとコンプライアンスの管理センターから、アクセス許可ポリシーを作成します。
Answer: A
Explanation:
Explanation
References:
https://docs.microsoft.com/en-us/sharepoint/restricted-domains-sharing?redirectSourcePath=%252fen-us%252f
Topic 2, Litware, inc Case Study:
Overview
Existing Environment
Litware, Inc. is a design and manufacturing company that has 4,500 users. The company has sales, marketing, design research, field test, and human resources (HR) departments.
Litware has a main office in California, three branches offices in the United States, and five branches offices in Europe.
On-premises Infrastructure
The network contains an Active Directory forest named litewareinc.com that contains a child domain for each region.
All domain controllers, run Windows Server 2012. The man office syncs identities to Microsoft Azure Active Directory (Azure AD) by using Azure Connect. All user accounts are created in the on-premises Active Directory and sync to Azure AD.
Each office contains the following servers and Client computers:
*A domain controller that runs Windows Server 2012.
*A file server that runs Windows Server 2012.
* Client computers that run Windows 10.
Currently, alt content created by users is stored locally on file servers.
Cloud Infrastructure
Litware is moving the content from the file servers to Microsoft Office 365. The company purchases 4,500 Microsoft 365 E5 licenses.
Liteware uses Microsoft Exchange Online for email.
Problem Statements
Liteware identifies the following issues:
Finding content and people within the organization is difficult.
Users cannot access company data outside the corporate network.
Content recovery is slow because all the content is still on-premises.
Data security is compromised because users can copy company content to USB drives.
The locally stored content to USB drives.
Users must frequently contact the HR department to find employees within the organization who have relevant skills.
Users can delete content indiscriminately and without resource as they have full control of the content of the file servers.
Requirements
Business Goals
Liteware identifies the following strategic initiatives to remain competitive:
All content must be stored centrally
Access to content must be based on the user's:
Department
Security level
Physical location
Users must be able to work on content offline
Users must be able to share content externally
Content classifications from mobile devices
Content classifications must include a physical location
Content must be retained and protected based on its type
Litware must adhere to highly confidential regulatory standards that include:
The ability to restrict the copying of all content created internally and externally Including accurate time zone reporting in audit trails Users must be able to search for content and people across the entire organization.
Content classification metadata must adhere to naming conventions specified by the IT department.
Users must be able to access content quickly without having to review many pages of search results to find documents.
Security rules must be implemented so that user access can be revoked if a user shares confidential content with external users.
Planned Changes
Liteware plans to implement the following changes:
*Move all department content to Microsoft SharePoint Online.
*Move all user content to Microsoft OneDrive for Business.
*Restrict user access based on location and device.
Technical Requirements
Liteware identifies the following technical requirements:
All content must be stored centrally
Access to content must be based on the user's:
Department
Security level
Physical location
Users must be able to work on content offline
Users must be able to share content externally
Content classifications from mobile devices
Content classifications must include a physical location
Content must be retained and protected based on its type
Litware must adhere to highly confidential regulatory standards that include:
The ability to restrict the copying of all content created internally and externally Including accurate time zone reporting in audit trails Users must be able to search for content and people across the entire organization.
Content classification metadata must adhere to naming conventions specified by the IT department.
Users must be able to access content quickly without having to review many pages of search results to find documents.
Security rules must be implemented so that user access can be revoked if a user shares confidential content with external users.
NEW QUESTION: 3
セキュリティ管理者のSamuelは、Webサーバーの構成を評価しています。彼は、サーバーがSSlv2接続を許可し、SSLv2接続を許可する別のサーバーで同じ秘密鍵証明書が使用されていることに気づきました。この脆弱性により、SSLv2サーバーが重要な情報を漏洩する可能性があるため、Webサーバーは攻撃に対して脆弱になります。
上記の脆弱性を悪用して実行できる攻撃は次のうちどれですか？
A. DUHK攻撃
B. オラクル攻撃のパディング
C. サイドチャネル攻撃
D. DROWN攻撃
Answer: D
Explanation:
DROWN is a serious vulnerability that affects HTTPS and other services that deem SSL and TLS, some of the essential cryptographic protocols for net security. These protocols allow everyone on the net to browse the net, use email, look on-line, and send instant messages while not third-parties being able to browse the communication.
DROWN allows attackers to break the encryption and read or steal sensitive communications, as well as passwords, credit card numbers, trade secrets, or financial data. At the time of public disclosure on March 2016, our measurements indicated thirty third of all HTTPS servers were vulnerable to the attack. fortuitously, the vulnerability is much less prevalent currently. As of 2019, SSL Labs estimates that one.2% of HTTPS servers are vulnerable.
What will the attackers gain?
Any communication between users and the server. This typically includes, however isn't limited to, usernames and passwords, credit card numbers, emails, instant messages, and sensitive documents. under some common scenarios, an attacker can also impersonate a secure web site and intercept or change the content the user sees.
Who is vulnerable?
Websites, mail servers, and other TLS-dependent services are in danger for the DROWN attack. At the time of public disclosure, many popular sites were affected. we used Internet-wide scanning to live how many sites are vulnerable:
Operators of vulnerable servers got to take action. there's nothing practical that browsers or end-users will do on their own to protect against this attack.
Is my site vulnerable?
Modern servers and shoppers use the TLS encryption protocol. However, because of misconfigurations, several servers also still support SSLv2, a 1990s-era precursor to TLS. This support did not matter in practice, since no up-to-date clients really use SSLv2. Therefore, despite the fact that SSLv2 is thought to be badly insecure, until now, simply supporting SSLv2 wasn't thought of a security problem, is a clients never used it.
DROWN shows that merely supporting SSLv2 may be a threat to fashionable servers and clients. It modern associate degree attacker to modern fashionable TLS connections between up-to-date clients and servers by sending probes to a server that supports SSLv2 and uses the same private key.
A server is vulnerable to DROWN if:
It allows SSLv2 connections. This is surprisingly common, due to misconfiguration and inappropriate default settings.
Its private key is used on any other serverthat allows SSLv2 connections, even for another protocol. Many companies reuse the same certificate and key on their web and email servers, for instance. In this case, if the email server supports SSLv2 and the web server does not, an attacker can take advantage of the email server to break TLS connections to the web server.
How do I protect my server?
To protect against DROWN, server operators need to ensure that their private keys software used anyplace with server computer code that enables SSLv2 connections. This includes net servers, SMTP servers, IMAP and POP servers, and the other software that supports SSL/TLS.
Disabling SSLv2 is difficult and depends on the particular server software. we offer instructions here for many common products:
OpenSSL: OpenSSL may be a science library employed in several server merchandise. For users of OpenSSL, the simplest and recommended solution is to upgrade to a recent OpenSSL version. OpenSSL 1.0.2 users ought to upgrade to 1.0.2g. OpenSSL 1.0.1 users ought to upgrade to one.0.1s. Users of older OpenSSL versions ought to upgrade to either one in every of these versions. (Updated March thirteenth, 16:00 UTC) Microsoft IIS (Windows Server): Support for SSLv2 on the server aspect is enabled by default only on the OS versions that correspond to IIS 7.0 and IIS seven.5, particularly Windows scene, Windows Server 2008, Windows seven and Windows Server 2008R2. This support is disabled within the appropriate SSLv2 subkey for 'Server', as outlined in KB245030. albeit users haven't taken the steps to disable SSLv2, the export-grade and 56-bit ciphers that build DROWN possible don't seem to be supported by default.
Network Security Services (NSS): NSS may be a common science library designed into several server merchandise. NSS versions three.13 (released back in 2012) and higher than ought to have SSLv2 disabled by default. (A little variety of users might have enabled SSLv2 manually and can got to take steps to disable it.) Users of older versions ought to upgrade to a more moderen version. we tend to still advocate checking whether or not your non-public secret is exposed elsewhere Other affected software and in operation systems:
Instructions and data for: Apache, Postfix, Nginx, Debian, Red Hat
Browsers and other consumers: practical nothing practical that net browsers or different client computer code will do to stop DROWN. only server operators ar ready to take action to guard against the attack.
NEW QUESTION: 4
A. xwininfo
B. cat /etc/X11
C. xcolordepth
D. xcd
E. xcdepth
Answer: A