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NEW QUESTION: 1
Which three statements about the IPsec ESP modes of operation are true? (Choose three.)
A. Tunnel mode only encrypts and authenticates the data.
B. Transport mode authenticates the IP header.
C. Tunnel mode is used between two security gateways.
D. Transport mode leaves the original IP header in the clear.
E. Tunnel mode is used between a host and a security gateway.
Answer: C,D,E
Explanation:
http://www.cisco.com/en/US/docs/net_mgmt/vpn_solutions_center/2.0/ip_security/provisioning/gui
de/IPsecPG1.html
The Encapsulating Security Payload (ESP)
The Encapsulating Security Payload (ESP) contains six parts as described below. The first two
parts are not encrypted, but they are authenticated. Those parts are as follows:
The Security Parameter Index (SPI) is an arbitrary 32-bit number that tells the device receiving the packet what group of security protocols the sender is using for communication. Those protocols include the particular algorithms and keys, and how long those keys are valid.
The Sequence Number is a counter that is incremented by 1 each time a packet is sent to the same address and uses the same SPI. The sequence number indicates which packet is which, and how many packets have been sent with the same group of parameters. The sequence number also protects against replay attacks.
Replay attacks involve an attacker who copies a packet and sends it out of sequence to confuse
communicating devices.
The remaining four parts of the ESP are all encrypted during transmission across the network.
Those parts are as follows:
The Payload Data is the actual data that is carried by the packet.
The Padding, from 0 to 255 bytes of data, allows certain types of encryption algorithms to require the data to be a multiple of a certain number of bytes. The padding also ensures that the text of a message terminates on a four-byte boundary (an architectural requirement within IP).
The Pad Length field specifies how much of the payload is padding rather than data.
The Next Header field, like a standard IP Next Header field, identifies the type of data carried and the protocol.
The ESP is added after a standard IP header. Because the packet has a standard IP header, the network can route it with standard IP devices. As a result, IPsec is backwards-compatible with IP routers and other equipment even if that equipment isn't designed to use IPsec. ESP can support any number of encryption protocols. It's up to the user to decide which ones to use. Different protocols can be used for every person a user communicates with. However, IPsec specifies a basic DES-Cipher Block Chaining mode (CBC) cipher as the default to ensure minimal interoperability among IPsec networks. ESP's encryption capability is designed for symmetric encryption algorithms. IPsec employs asymmetric algorithms for such specialized purposes as negotiating keys for symmetric encryption.
Tunneling with ESP Tunneling takes an original IP packet header and encapsulates it within the ESP. Then, it adds a new IP header containing the address of a gateway device to the packet. Tunneling allows a user to send illegal IP addresses through a public network (like the Internet) that otherwise would not accept them. Tunneling with ESP offers the advantage of hiding original source and destination addresses from users on the public network. Hiding these addresses reduces the power of traffic analysis attacks. A traffic analysis attack employs network monitoring techniques to determine how much data and what type of data is being communicated between two users.
NEW QUESTION: 2
HOTSPOT
You have set up your Mac to share files with windows users. Now you need to enable a Windows user, Carla, to connect to your Mac over smb. In the screenshot, click the interface element that will let you perform that task.
Hot Area:
Answer:
Explanation:
NEW QUESTION: 3
Evaluate the following CREATE SEQUENCE statement:
CREATE SEQUENCE seq1 START WITH 100 INCREMENT BY 10 MAXVALUE 200 CYCLE NOCACHE;
The SEQ1 sequence has generated numbers up to the maximum limit of 200. You issue the following SQL statement:
SELECT seq1.nextval FROM dual;
What is displayed by the SELECT statement?
A. 0
B. 1
C. an error
D. 2
Answer: D
Explanation:
But why the answer is not "C" ?
Because you didn't specify the MINVALUE for the sequence. If you check the sequence definition that you created it will have the default value of 1, which it reverts to when cycling.
If you wanted to keep the minimum value you would need to specify it in the sequence creation. sequence Is the name of the sequence generator INCREMENT BY n Specifies the interval between sequence numbers, where n is an integer (If this
clause is omitted, the sequence increments by 1.)
START WITH n Specifies the first sequence number to be generated (If this clause is omitted, the sequence starts with 1.) MAXVALUE n Specifies the maximum value the sequence can generate NOMAXVALUE Specifies a maximum value of 10