Testking cisco 646-057
Vendor: cisco
Exam Code: 646-057
Exam Name: Access Routing and LAN Switching Routing and Switching AM Exam (Access Routing and LAN Switching )
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Question: 6.
Exhibit:
What is the expected behavior of IP traffic from the clients attached to the two Ethernet subnets?
A. Traffic between the Ethernet subnets on both routers will have to be decrypted.
B. NAT will translate the traffic between the Ethernet subnets on both routers.
C. Traffic will successfully access the Internet, though it will have to be decrypted between the
router’s Ethernet subnets.
D. Traffic will successfully access the Internet fully encrypted.
E. Traffic bound for the Internet will not be routed because the source IP addresses are private.
Answer: C
Explanation:
NOT ENOUGH OF THE ESHIBIT TO MAKE A REAL CHOICE. THE ESHIBIT IS ONE OF
IPSEC TAKE YOUR BEST SHOT.
Question: 7.
A ping of death is when:
A. An IP datagram is received with the “protocol” field in the IP header set to 1 (ICMP) and the
“type”field in the ICMP header is set to 18 (Address Mask Reply).
B. An IP datagram is received with the “protocol” field in the IP header set to 1 (ICMP), the Last
Fragment bit is set, and (IP offset ‘ 
+ (IP data length) >65535. In other words, the IP offset
(which represents the starting position of this fragment in the original packet, and which is in 8-
byte units) plus the rest of the packet is greater than the maximum size for an IP packet.
C. An IP datagram is received with the “protocol” field in the IP header set to 1 (ICMP) and the
source equal to destination address.
D. The IP header is set to 1 (ICMP) and the “type” field in the ICMP header is set to 5 (Redirect).
Answer: B
Explanation:
“A hacker can send an IP packet to a vulnerable machine such that the last fragment contains an
offest where (IP offset *8) + (IP data length)>65535. This means that when the packet is
reassembled, its total length is larger than the legal limit, causing buffer overruns in the machine’s
OS (becouse the buffer sizes are defined only to accomodate the maximum allowed size of the
packet based on RFC 791)…IDS can generally recongize such attacks by looking for packet
fragments that have the IP header’s protocol field set to 1 (ICMP), the last bit set, and (IP offset
*8) +(IP data length)>65535″ CCIE Professional Development Network Security Principles and
Practices by Saadat Malik pg 414 “Ping of Death” attacks cause systems to react in an
unpredictable fashion when receiving oversized IP packets. TCP/IP allows for a maximum packet
size of up to 65536 octets (1 octet = 8 bits of data), containing a minimum of 20 octets of IP
header information and zero or more octets of optional information, with the rest of the packet
being data. Ping of Death attacks can cause crashing, freezing, and rebooting.
Question: 8.
Why would a Network Administrator want to use Certificate Revocation Lists (CRLs) in their
IPSec implementations?
A. They allow the ability to do “on the fly” authentication of revoked certificates.
B. They help to keep a record of valid certificates that have been issued in their network.
C. They allow them to deny devices with certain certificates from being authenticated to their
network.
D. Wildcard keys are much more efficient and secure. CRLs should only be used as a last resort.
Answer: C
Explanation:
A method of certificate revocation. A CRL is a time-stamped list identifying revoked certificates,
which is signed by a CA and made available to the participating IPSec peers on a regular periodic
basis (for example, hourly, daily, or weekly). Each revoked certificate is identified in a CRL by its
certificate serial number. When a participating peer device uses a certificate, that system not only
checks the certificate signature and validity but also acquires a most recently issued CRL and
checks that the certificate serial number is not on that CRL.
Question: 9.
A SYN flood attack is when:
A. A target machine is flooded with TCP connection requests with randomized source address &
ports for the TCP ports.
B. A target machine is sent a TCP SYN packet (a connection initiation), giving the target host’s
address as both source and destination, and is using the same port on the target host as both
source and destination.
C. A TCP packet is received with the FIN bit set but with no ACK bit set in the flags field.
D. A TCP packet is received with both the SYN and the FIN bits set in the flags field.
Answer: A
Explanation:
To a server that requires an exchange of a sequence of messages. The client system begins by
sending a SYN message to the server. The server then acknowledges the SYN message by
sending a SYNACK message to the client. The client then finishes establishing the connection by
responding with an ACK message and then data can be exchanged. At the point where the
server system has sent an acknowledgment (SYN-ACK) back to client but has not yet received
the ACK message, there is a half-open connection.
A data structure describing all pending connections is in memory of the server that can be made
to overflow by intentionally creating too many partially open connections. Another common attack
is the SYN flood, in which a target machine is flooded with TCP connection requests. The source
addresses and source TCP ports of the connection request packets are randomized; the purpose
is to force the target host to maintain state information for many connections that will never be
completed. SYN flood attacks are usually noticed because the target host (frequently an HTTP or
SMTP server) becomes extremely slow, crashes, or hangs. It’s also possible for the traffic
returned from the target host to cause trouble on routers; because this return traffic goes to the
randomized source addresses of the original packets, it lacks the locality properties of “real” IP
traffic, and may overflow route caches. On Cisco routers, this problem often manifests itself in the
router running out of memory.
Question: 10.
What kind of interface is not available on the Cisco Secure Intrusion Detection System sensor?
A. Ethernet
B. Serial
C. Token Ring
D. FDDI
Answer: B
Explanation:
Sensors are optimized for specific data rates and are packaged in Ethernet, Fast Ethernet
(100BaseT), Token Ring, and FDDI configurations
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Questions and Answers : 122 Q&As
Updated: 2008-12-01
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December 23rd, 2008 at 1:36 am
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