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Q1. Refer to the exhibit. After configuring GRE between two routers running OSPF that are connected to each other via a WAN link, a network engineer notices that the two routers cannot establish the GRE tunnel to begin the exchange of routing updates. What is the reason for this?
A. Either a firewall between the two routers or an ACL on the router is blocking IP protocol number 47.
B. Either a firewall between the two routers or an ACL on the router is blocking UDP 57.
C. Either a firewall between the two routers or an ACL on the router is blocking TCP 47.
D. Either a firewall between the two routers or an ACL on the router is blocking IP protocol number 57.
Answer: A
Explanation:
Q2. Scenario:
You have been asked to evaluate an OSPF network setup in a test lab and to answer questions a customer has about its operation. The customer has disabled your access to the show running-config command.
How old is the Type 4 LSA from Router 3 for area 1 on the router R5 based on the output you have examined?
A. 1858
B. 1601
C. 600
D. 1569
Answer: A
Explanation:
Q3. Refer to the following access list.
access-list 100 permit ip any any log
After applying the access list on a Cisco router, the network engineer notices that the router CPU utilization has risen to 99 percent. What is the reason for this?
A. A packet that matches access-list with the "log" keyword is Cisco Express Forwarding switched.
B. A packet that matches access-list with the "log" keyword is fast switched.
C. A packet that matches access-list with the "log" keyword is process switched.
D. A large amount of IP traffic is being permitted on the router.
Answer: C
Explanation:
Logging-enabled access control lists (ACLs) provide insight into traffic as it traverses the
network or is dropped by network devices. Unfortunately, ACL logging can be CPU intensive and can
negatively affect other functions of the network device. There are two primary factors that contribute to the
CPU load increase from ACL logging: process switching of packets that match log-enabled access control
entries (ACEs) and the generation and transmission of log messages. Reference: http://www.cisco.com/
web/about/security/intelligence/acl-logging.html#4
Q4. Which statement about the NPTv6 protocol is true?
A. It is used to translate IPv4 prefixes to IPv6 prefixes.
B. It is used to translate an IPv6 address prefix to another IPv6 prefix.
C. It is used to translate IPv6 prefixes to IPv4 subnets with appropriate masks.
D. It is used to translate IPv4 addresses to IPv6 link-local addresses.
Answer: B
Explanation:
Q5. Which protocol uses dynamic address mapping to request the next-hop protocol address for a specific connection?
A. Frame Relay inverse ARP
B. static DLCI mapping
C. Frame Relay broadcast queue
D. dynamic DLCI mapping
Answer: A
Explanation:
Dynamic address mapping uses Frame Relay Inverse ARP to request the next-hop protocol address for a
specific connection, given its known DLCI. Responses to
Inverse ARP requests are entered in an address-to-DLCI mapping table on the router or access server; the
table is then used to supply the next-hop protocol
address or the DLCI for outgoing traffic.
Reference:
http://www.cisco.com/c/en/us/td/docs/ios/12_2/wan/configuration/guide/fwan_c/wcffrely.html
Q6. A network engineer is configuring a solution to allow failover of HSRP nodes during maintenance windows, as an alternative to powering down the active router and letting the network respond accordingly. Which action will allow for manual switching of HSRP nodes?
A. Track the up/down state of a loopback interface and shut down this interface during maintenance.
B. Adjust the HSRP priority without the use of preemption.
C. Disable and enable all active interfaces on the active HSRP node.
D. Enable HSRPv2 under global configuration, which allows for maintenance mode.
Answer: A
Explanation:
The standby track command allows you to specify another interface on the router for the
HSRP process to monitor in order to alter the HSRP priority for a given group. If the line protocol of the
specified interface goes down, the HSRP priority is reduced. This means that another HSRP router with
higher priority can become the active router if that router has standby preempt enabled. Loopback
interfaces can be tracked, so when this interface is shut down the HSRP priority for that router will be
lowered and the other HSRP router will then become the active one. Reference: http://www.cisco.com/c/
en/us/support/docs/ip/hot-standby-router-protocol- hsrp/13780-6.html