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NEW QUESTION: 1
On a corporate network, hosts on the same VLAN can communicate with each other, but they are unable to
communicate with hosts on different VLANs. What is needed to allow communication between the VLANs?
A. a switch with an access link that is configured between the switches
B. a router with subinterfaces configured on the physical interface that is connected to the switch
C. a switch with a trunk link that is configured between the switches
D. a router with an IP address on the physical interface connected to the switch
Answer: B
Explanation:
Different VLANs can't communicate with each other, they can communicate with the help of Layer3 router. Hence, it is
needed to connect a router to a switch, then make the sub-interface on the router to connect to the switch,
establishing Trunking links to achieve communications of devices which belong to different VLANs.
When using VLANs in networks that have multiple interconnected switches, you need to use VLAN trunking between
the switches. With VLAN trunking, the switches tag each frame sent between switches so that the receiving switch
knows to what VLAN the frame belongs. End user devices connect to switch ports that provide simple connectivity to
a single VLAN each. The attached devices are unaware of any VLAN structure.
By default, only hosts that are members of the same VLAN can communicate. To change this and allow inter-VLAN
communication, you need a router or a layer 3 switch.
Here is the example of configuring the router for inter-vlan communication
RouterA(config)#int f0/0.1
RouterA(config-subif)#encapsulation ?
dot1Q IEEE 802.1Q Virtual LAN
RouterA(config-subif)#encapsulation dot1Q or isl VLAN ID
RouterA(config-subif)# ip address x.x.x.x y.y.y.y

NEW QUESTION: 2
Timestamps and sequence numbers act as countermeasures against which of the following types of
attacks?
A. DoS
B. Smurf
C. Replay
D. Vishing
Answer: C
Explanation:
Section: Threats and Vulnerabilities
Explanation/Reference:
Explanation:
A replay attack (also known as playback attack) is a form of network attack in which a valid data
transmission is maliciously or fraudulently repeated or delayed. This is carried out either by the originator
or by an adversary who intercepts the data and retransmits it, possibly as part of a masquerade attack by
IP packet substitution (such as stream cipher attack).
For example: Suppose Alice wants to prove her identity to Bob. Bob requests her password as proof of
identity, which Alice dutifully provides (possibly after some transformation like a hash function); meanwhile,
Eve is eavesdropping on the conversation and keeps the password (or the hash). After the interchange is
over, Eve (posing as Alice) connects to Bob; when asked for a proof of identity, Eve sends Alice's
password (or hash) read from the last session, which Bob accepts thus granting access to Eve.
Countermeasures: A way to avoid replay attacks is by using session tokens: Bob sends a one-time token
to Alice, which Alice uses to transform the password and send the result to Bob (e.g. computing a hash
function of the session token appended to the password). On his side Bob performs the same
computation; if and only if both values match, the login is successful. Now suppose Eve has captured this
value and tries to use it on another session; Bob sends a different session token, and when Eve replies
with the captured value it will be different from Bob's computation.
Session tokens should be chosen by a (pseudo-) random process. Otherwise Eve may be able to pose as
Bob, presenting some predicted future token, and convince Alice to use that token in her transformation.
Eve can then replay her reply at a later time (when the previously predicted token is actually presented by
Bob), and Bob will accept the authentication.
One-time passwords are similar to session tokens in that the password expires after it has been used or
after a very short amount of time. They can be used to authenticate individual transactions in addition to
sessions. The technique has been widely implemented in personal online banking systems.
Bob can also send nonces but should then include a message authentication code (MAC), which Alice
should check.
Timestamping is another way of preventing a replay attack. Synchronization should be achieved using a
secure protocol. For example, Bob periodically broadcasts the time on his clock together with a MAC.
When Alice wants to send Bob a message, she includes her best estimate of the time on his clock in her
message, which is also authenticated. Bob only accepts messages for which the timestamp is within a
reasonable tolerance. The advantage of this scheme is that Bob does not need to generate (pseudo-)
random numbers, with the trade-off being that replay attacks, if they are performed quickly enough i.e.
within that 'reasonable' limit, could succeed.

NEW QUESTION: 3
Which setup is correct when you configure Cisco UCS B-Series VICs (M81KR/12xx VICs) for Cisco Unified Contact Center Enterprise on Cisco UCS B-Series deployments?
A. Enable this Fabric Failover when the connected upstream network is operating in a Common Layer 2 domain.
B. Enable Fabric Failover as an extra redundancy measure so that traffic from the UCS B-Series blade has the HA paths. (Both FI-A and FI-B paths are used in a failover scheme.)
C. Disable the Fabric Failover option.
D. Disregard this option because either mode is fine with Cisco Unified CCE on UCS B-Series deployments.
E. Disable this Fabric Failover when the connected upstream network is operating in a Disjointed Layer 2 domain.
Answer: C