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NEW QUESTION: 1
If two routing protocols have the same route and prefix, which effect do they have on the routing table?
A. Neither route is added, and a loop is formed.
B. Only the route with the highest administrative distance is added.
C. Only the route with the lowest administrative distance is added.
D. Both routes are added.
Answer: C
Explanation:
Explanation/Reference:
Explanation:
NEW QUESTION: 2
Which of the following steps are necessary to configure OSPF on a Huawei router? (Choose three)
A. Configuration of a router ID
B. Specifying an OSPF area
C. Enabling of an OSPF process
D. Configuration of the network segments within each area
Answer: B,C,D
NEW QUESTION: 3
In a data sharing environment, how is the LRSN value created?
A. It is selected from the DB2 catalog.
B. It is derived from the sysplex timer (store clock).
C. It is generated from a sequence object.
D. It is derived from combining RBAs from multiple members.
Answer: B
NEW QUESTION: 4
What attack technique uses double VLAN tagging to access network devices that might not otherwise be
accessible?
A. DHCP spoofing
B. VLAN hopping
C. Rogue devices
D. MAC flooding
Answer: B
Explanation:
Explanation/Reference:
Explanation:
Double VLAN tagging is used by a VLAN hopping attack. An attacker can create a packet with two VLAN
headers on it and send it to a switch. The switch port will strip off the first header and leave the second.
The second header will be seen as the originating VLAN, allowing the attacker access to a VLAN they are
not connected to. This becomes a security concern because this hopping can be accomplished without
passing through a router and its security access lists. For this reason, private VLANs and VACLs should
be used to secure access between VLANs.
DHCP spoofing is an attack that can be used to force user traffic through an attacking device. This is
accomplished by an attacker responding to DHCP queries from users. Eliminating the response from the
correct DHCP server would make this more effective, but if the attacker's response gets to the client first,
the client will accept it. The DHCP response from the attacker will include a different gateway or DNS
server address. If they define a different gateway, the user traffic will be forced to travel through a device
controlled by the attacker. This will allow the attacker to capture traffic and gain company information. If the
attacker changes the DNS server in the response, they can use their own DNS server to force traffic to
selected hosts to go to a device they control. Again, this would allow the attacker to capture traffic and gain
information.
MAC flooding is an attack technique that attempts to fill a switch's MAC address table so the attacker can
capture flooded traffic sent from the switch. The concept of this attack is to use the CAM table limit to the
attacker's advantage. The attacker would send packets addressed from a large number of MAC addresses
to the switch. The switch adds the source MAC address to the MAC address table. Eventually no more
MAC addresses can be added because the table is full. When this occurs, any packets destined for a MAC
address not in the table will be flooded to all other ports. This would allow the attacker to see the flooded
traffic and capture information. The switch would be essentially functioning as a hub in this case.
A rogue device is a device attached to the network that is not under the control of the organization. This
term is normally used to mean a wireless device, perhaps an access point that is not operating as a part of
the company's infrastructure. Employees may bring their own access points and connect them to the
network so they can use their computer wirelessly. This creates a security gap since the device is probably
not secured to protect the traffic. An attacker could connect a rogue access point to a company's network
and capture traffic from outside the company's premises.
Objective:
Infrastructure Security
Sub-Objective:
Configure and verify switch security features
References:
Cisco > Products and Services > Switches > Cisco Catalyst 6500 Series Switches > Product Literature >
White Papers > Cisco Catalyst 6500 Series Switches > VLAN Security White Paper > Double-
Encapsulated 802.1Q/Nested VLAN Attack