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NEW QUESTION: 1
An internal router is sending UDP keep-alive packets that are being encapsulated with GRE and sent through your R77 Security Gateway to a partner site. A rule for GRE traffic is configured for ACCEPT/LOG. Although the keep-alive packets are being sent every minute, a search through the SmartView Tracker logs for GRE traffic only shows one entry for the whole day (early in the morning after a Policy install).
Your partner site indicates they are successfully receiving the GRE encapsulated keep-alive packets on the 1-minute interval.
If GRE encapsulation is turned off on the router, SmartView Tracker shows a log entry for the UDP keep- alive packet every minute.
Which of the following is the BEST explanation for this behavior?
A. The Log Server is failing to log GRE traffic properly because it is VPN traffic. Disable all VPN configuration to the partner site to enable proper logging.
B. The log unification process is using a LUUID (Log Unification Unique Identification) that has become corrupt. Because it is encrypted, the R77 Security Gateway cannot distinguish between GRE sessions.
This is a known issue with GRE. Use IPSEC instead of the non-standard GRE protocol for encapsulation.
C. The setting Log does not capture this level of detail for GRE. Set the rule tracking action to Audit since certain types of traffic can only be tracked this way.
D. The Log Server log unification process unifies all log entries from the Security Gateway on a specific connection into only one log entry in the SmartView Tracker. GRE traffic has a 10 minute session timeout, thus each keep-alive packet is considered part of the original logged connection at the beginning of the day.
Answer: D
NEW QUESTION: 2
Refer to the exhibit.
An attacker is connected to interface Fa0/11 on switch A-SW2 and attempts to establish a DHCP server for a man-in-middle attack. Which recommendation, if followed, would mitigate this type of attack?
A. All switch ports in the Server Farm block should be configured as DHCP untrusted ports.
B. All switch ports in the Building Access block should be configured as DHCP untrusted ports.
C. All switch ports connecting to hosts in the Building Access block should be configured as DHCP untrusted ports.
D. All switch ports connecting to servers in the Server Farm block should be configured as DHCP untrusted ports.
E. All switch ports in the Building Access block should be configured as DHCP trusted ports.
F. All switch ports connecting to hosts in the Building Access block should be configured as DHCP trusted ports.
Answer: C
Explanation:
One of the ways that an attacker can gain access to network traffic is to spoof responses that would be sent by a valid DHCP server. The DHCP spoofing device replies to client DHCP requests. The legitimate server may reply also, but if the spoofing device is on the same segment as the client, its reply to the client may arrive first. The intruder's DHCP reply offers an IP address and supporting information that designates the intruder as the default gateway or Domain Name System (DNS) server. In the case of a gateway, the clients will then forward packets to the attacking device, which will in turn send them to the desired destination. This is referred to as a "man-in-the-middle" attack, and it may go entirely undetected as the intruder intercepts the data flow through the network. Untrusted ports are those that are not explicitly configured as trusted. A DHCP binding table is built for untrusted ports. Each entry contains the client MAC address, IP address, lease time, binding type, VLAN number, and port ID recorded as clients make DHCP requests. The table is then used to filter subsequent DHCP traffic. From a DHCP snooping perspective, untrusted access ports should not send any DHCP server responses, such as DHCPOFFER, DHCPACK, DHCPNAK.
Reference: Understanding and Configuring DHCP Snooping
(http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.1/13ew/configuration/guide/dhcp. html)
NEW QUESTION: 3
Which two commands are required to enable multicast on a router, knowing that the receivers only support IGMPv2? (Choose two.)
A. ip pim sparse-mode
B. ip pim ssm
C. ip pim passive
D. ip pim rp-address
Answer: A,D
Explanation:
Sparse mode logic (pull mode) is the opposite of Dense mode logic (push mode), in Dense mode it is supposed that in every network there is someone who is requesting the multicast traffic so PIM-DM routers begin by flooding the multicast traffic out of all their interfaces except those from where a prune message is received to eliminate the "leaf" from the multicasting tree (SPT), the Source-Based Tree (S, G); as opposed to Sparse mode that send the traffic only if someone explicitly requested it.
Not like Dense mode, which build a separated source-based tree (S, G) between the source and the requester of the traffic, Sparse mode mechanism is based on a fixed point in the network named Rendez-Vous point.
All sources will have to register with the RP to which they send their traffic and thereby build a source-based tree (S, G) between them and the RP (not with the final multicast receiver like in PIM-DM) and all PIM-SM routers, "whatever" multicast traffic they are requesting, have to register with the RP and build a shared-tree (*. G)
Reference http://tools.ietf.org/html/rfc2236 http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a00800 b0871.shtml http://www.cisco.com/en/US/tech/tk828/technologies_tech_note09186a0080094821.shtml# sparsemode