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NEW QUESTION: 1
Which Cisco MDS 9700 Series platform supports the Supervisor-1E module?
A. Cisco MDS 9709
B. Cisco MDS 9710
C. Cisco MDS 9718
D. Cisco MDS 9706
Answer: C
NEW QUESTION: 2
Under which circumstance should a network administrator implement one-way NAT?
A. when traffic that originates outside the network must be routed to internal hosts
B. when traffic that originates inside 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: A
Explanation:
Explanation/Reference:
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: 3
An overseas branch office within a company has many more technical and non-technical security incidents than other parts of the company. Which of the following management controls should be introduced to the branch office to improve their state of security?
A. Continuous security monitoring processes
B. Event log analysis and incident response
C. Firewall, IPS and network segmentation
D. Initial baseline configuration snapshots
Answer: A
Explanation:
Continuous monitoring may involve regular measurements of network traffic levels, routine evaluations for regulatory compliance, and checks of network security device configurations. It also points toward the never-ending review of what resources a user actually accesses, which is critical for preventing insider threats.
Incorrect Options:
A: An initial baseline configuration snapshot would allow for the standardized minimal level of security that all systems in an organization must comply with to be enforced. This will not cover the non-technical security incidents.
B: A Firewall, IPS and network segmentation will offer technical protection, but not non- technical security protection.
C: Event log analysis and incident response will not cover the non-technical security incidents.
Reference:
Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, 6th Edition, Sybex, Indianapolis, 2014, p. 154.
Stewart, James Michael, CompTIA Security+ Review Guide, Sybex, Indianapolis, 2014, pp.
207, 208
NEW QUESTION: 4
Which statement about foreign keys is true?
A. A table can have only one foreign key.
B. Foreign keys are enforced only during the execution of INSERT statements.
C. A foreign key can be defined on a column or a set of columns in a table.
D. Foreign keys can only be defined when a table is created.
Answer: C
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