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NEW QUESTION: 1
Which statement describes drawing a curved path with the Pen tool?
A. Click twice to set the two points. Click-drag the second point to set the curve
B. Click once to set the first point. Hold Option and click to set the second point
C. Click once to set the first point. Hold Control and click to set the second point
D. Click once to set the first point. Click-drag and release to set the second point
Answer: A
NEW QUESTION: 2
What is a reason to create a virtual link between two OSPF routers?
A. to permit an OSPF adjacency between two VSF fabrics
B. to permit OSPF to operate between two routers that also run VRRP
C. to monitor connectivity with the neighbor, but not exchange the routing table
D. to create a connection between two areas that are not directly connected to Area 0
Answer: D
NEW QUESTION: 3
Which of the following statements regarding the stub area in OSPF are true?
A. A backbone area cannot be configured as a stub area.
B. A virtual link cannot pass through a stub area.
C. Type 7 LSAs cannot be flooded to a stub area.
D. A stub area contains no ASBR.
Answer: D
NEW QUESTION: 4
What Cisco switch features are designed to work together to mitigate ARP spoofing attacks? (Choose
two.)
A. DAI
B. DHCP snooping
C. port security
D. 802.1x
Answer: A,B
Explanation:
Explanation/Reference:
Explanation:
Dynamic ARP inspection (DAI) and DHCP snooping are Cisco features designed to work together to
mitigate ARP spoofing attacks. DAI validates ARP packets in a network. DAI determines the validity of an
ARP packet based on the valid MAC address-to-IP-address bindings stored in the DHCP snooping
database. This capability protects the network from some man-in-the-middle attacks. The following global
configuration command instructs the switch to intercept, log, and discard packets with invalid IP-to-MAC
address bindings for the specified VLANs.
switch(config)# ip arp inspection vlan 10-12,15
When configuring DAI, ports are configured as either trusted or untrusted. DAI forwards all packets
received on a trusted interface without checks but intercepts all packets on an untrusted port.
DHCP snooping creates an IP address to MAC address database that DAI uses to validate ARP packets. It
compares the MAC address and IP address in ARP packets and only permits the traffic if the addresses
match. This eliminates attackers spoofing MAC addresses. The following command enables DHCP MAC
address verification:
router(config)# ip dhcp snooping verify mac-address
DHCP Authorized ARP can also be used to mitigate ARP spoofing. When implemented, the server assigns
an IP address to a client and then creates a static mapping. The DHCP server then sends periodic ARPs
to clients to make sure that the clients are still active. Clients respond with an ARP reply. Unauthorized
clients cannot respond to these periodic ARPs. The unauthorized ARP responses are blocked at the
DHCP server.
DHCP snooping also is used to define ports as trusted for DHCP server connections. The purpose of
DHCP snooping is to mitigate DHCP spoofing attacks. DHCP snooping can be used to determine what
ports are able to send DHCP server packets such as DHCPOFFER, DHCPACK, and DHCPNAK. DHCP
snooping can also cache the MAC address to IP address mapping for clients receiving DHCP addresses
from a valid DHCP server.
Port security is a method of only permitting specified MAC addresses access to a switch port. This can be
used to define what computer or device can be connected to a port, but not eliminate ARP spoofing.
802.1x is a method of determining authentication before permitting access to a switch port. This is useful in
restricting who can connect to the switch; it does not inspect ARP packets.
Objective:
Infrastructure Security
Sub-Objective:
Configure and verify switch security features
References:
Catalyst 6500 Release 12.2SXF and Rebuilds Software Configuration Guide > Configuring Dynamic ARP
Inspection (DAI)
Cisco > Cisco IOS IP Addressing Services Command Reference > ARP Commands > ip arp inspection
vlan