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From which of the following attacks can Message Authentication Code (MAC) shield your network?
A. SYN floods
B. DoS
C. DDoS
D. spoofing
Answer: D
Explanation:
Message Authentication Code (MAC) can shield your network from spoofing attacks. Spoofing, also known as
masquerading, is a popular trick in which an attacker intercepts a network packet, replaces the source address of the
packets header with the address of the authorized host, and reinserts fake information which is sent to the receiver.
This type of attack involves modifying packet contents. MAC can prevent this type of attack and ensure data integrity
by ensuring that no data has changed. MAC also protects against frequency analysis, sequence manipulation, and
ciphertext-only attacks.
MAC is a secure message digest that requires a secret key shared by the sender and receiver, making it impossible for
sniffers to change both the data and the MAC as the receiver can detect the changes.
A denial-of-service (DoS) attack floods the target system with unwanted requests, causing the loss of service to users.
One form of this attack generates a flood of packets requesting a TCP connection with the target, tying up all
resources and making the target unable to service other requests. MAC does not prevent DoS attacks. Stateful packet
filtering is the most common defense against a DoS attack.
A Distributed Denial of Service attack (DDoS) occurs when multiple systems are used to flood the network and tax the
resources of the target system. Various intrusion detection systems, utilizing stateful packet filtering, can protect
against DDoS attacks.
In a SYN flood attack, the attacker floods the target with spoofed IP packets and causes it to either freeze or crash. A
SYN flood attack is a type of denial of service attack that exploits the buffers of a device that accept incoming
connections and therefore cannot be prevented by MAC. Common defenses against a SYN flood attack include
filtering, reducing the SYN-RECEIVED timer, and implementing SYN cache or SYN cookies.
You create two private networks and are configuring the networks to communicate with each other within a single tenant. Drag and drop the tasks on the left to the correct order on the right.
Answer:
Explanation:
What is one benefit of PVST+?
A. PVST+ reduces the CPU cycles for all the switches in the network.
B. PVST+ allows the root switch location to be optimized per VLAN.
C. PVST+ automatically selects the root bridge location, to provide optimized bandwidth usage.
D. PVST+ supports Layer 3 load balancing without loops.
Answer: B
Explanation:
Per VLAN Spanning Tree (PVST) Introduction http://www.cisco.com/en/US/tech/tk389/tk621/tk846/tsd_technology_support_subprotocol_home.html Per VLAN Spanning Tree (PVST) maintains a spanning tree instance for each VLAN configured in the network. This means a switch can be the root bridge of a VLAN while another switch can be the root bridge of other VLANs in a common topology. For example, Switch 1 can be the root bridge for Voice data while Switch 2 can be the root bridge for Video data. If designed correctly, it can optimize the network traffic. http://www.ciscopress.com/articles/article.asp?p=102157&seqNum=4
Ein Unternehmen ist besorgt über die Sicherheit sensibler Daten auf einem Laptop, den ein Benutzer häufig außerhalb des Unternehmens mitnimmt. Welche der folgenden Optionen ermöglicht die Hardwareverschlüsselung zum Sichern von Benutzerdaten?
A. Ruhezustand
B. Bildschirmschonersperre
C. Vertrauenswürdiges Plattformmodul
D. BIOS-Passwort
Answer: C
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