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Q1. DRAG DROP
Drag and drop the BGP attribute on the left to the correct category on the right.
Answer:
Q2. Which two options are contained in the MSG part of a syslog message? (Choose two.)
A. TAG field
B. CONTENT field
C. three-digit priority value
D. IP address of the sending device
E. TLS port number
Answer: A,B
Q3. Which two statements about Layer 2 Frame Prioritization bits are true? (Choose two.)
A. 802.1Q frame headers carry the CoS value in the three most-significant bits of the 2-byte Tag Control Information field.
B. ISL frame headers carry an IEEE 802.1P CoS value in the three least-significant bits of the 2-byte User field.
C. ISL frame headers carry an IEEE 802.1P CoS value in the three most-significant bits of the 1-byte User field.
D. On 802.1Q trunks, traffic in the native VLAN is carried in 802.1Q frames.
E. Only 802.1Q and ISL frame types can carry CoS information.
F. On 802.1Q trunks, traffic in the native VLAN is carried in 802.1P frames.
Answer: A,E
Q4. Which measure does IS-IS use to avoid sending traffic with a wrong MTU configuration?
A. IS-IS does not protect from MTU mismatch.
B. MTU value is communicated in IS-IS Sequence Number PDUs (SNP), and IS-IS adjacency is not established if an MTU mismatch is detected.
C. IS-IS uses path MTU discovery as specified in RFC 1063.
D. IS-IS uses padding of hello packets to full MTU.
Answer: D
Explanation:
Intermediate System-to-Intermediate System (IS-IS) hellos are padded to the full maximum transmission unit (MTU) size. The benefit of padding IS-IS Hellos (IIHs) to the full MTU is that it allows for early detection of errors due to transmission problems with large frames or due to mismatched MTUs on adjacent interfaces.
Reference: http://www.cisco.com/c/en/us/support/docs/ip/integrated-intermediate-system-to-intermediate-system-is-is/47201-isis-mtu.html
Q5. What is the most common use for route tagging in EIGRP?
A. to determine the route source for management purposes
B. to change the metric of a prefix
C. to filter routes in order to prevent routing loops
D. to modify path selection for certain classes of traffic
Answer: C
Q6. Which two Cisco Express Forwarding tables are located in the data plane? (Choose two.)
A. the forwarding information base
B. the label forwarding information base
C. the IP routing table
D. the label information table
E. the adjacency table
Answer: A,B
Explanation:
The control plane runs protocols such as OSPF, BGP, STP, LDP. These protocols are needed so that routers and switches know how to forward packets and frames.
The data plane is where the actual forwarding takes place. The data plane is populated based on the protocols running in the control plane. The Forwarding Information Base (FIB) is used for IP traffic and the Label FIB is used for MPLS.
Q7. Which authentication types does OSPF support?
A. null and clear text
B. MD5 only
C. MD5 and clear text
D. null, clear text, and MD5
E. clear text only
Answer: D
Q8. A configuration includes the line ip route 10.0.0.0 255.0.0.0 172.16.10.10 permanent.
Which option is a benefit of configuring this static route as permanent?
A. It allows the route to be redistributed into the network even if the outgoing interface is down.
B. It allows the route to be saved in the running configuration of the device.
C. It places a hidden tag on the route that can be matched on other devices.
D. It allows the route to have a tracking status even if no tracking object is configured.
Answer: A
Q9. Which two technologies are supported by EIGRP? (Choose two.)
A. clear-text authentication
B. MD5 authentication
C. stub routing
D. multiple areas
Answer: B,C
Explanation:
The IP Enhanced IGRP Route Authentication feature provides MD5 authentication of routing updates from the EIGRP routing protocol. The MD5 keyed digest in each EIGRP packet prevents the introduction of unauthorized or false routing messages from unapproved sources. The EIGRP stub routing feature improves network stability, reduces resource utilization, and simplifies the stub device configuration. Stub routing is commonly used in hub-and-spoke network topologies. In a hub-and-spoke network, one or more end (stub) networks are connected to a remote device (the spoke) that is connected to one or more distribution devices (the hub). The remote device is adjacent to one or more distribution devices. The only route for IP traffic to reach the remote device is through a distribution device.
References: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/15-s/ire-15-s-book/ire-rte-auth.html http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/15-s/ire-15-s-book/ire-eigrp-stub-rtg.html
Q10. In which way does the Bridge Assurance mechanism modify the default spanning-tree behavior in an effort to prevent bridging loops?
A. Received BPDUs are looped back toward the sender to ensure that the link is bidirectional.
B. If BPDUs are no longer received on a port, the switch immediately sends out a TCN BPDU.
C. Extended topology information is encoded into all BPDUs.
D. BPDUs are sent bidirectional on all active network ports, including blocked and alternate ports.
Answer: D
Q11. Which two statements about the MAC address table space are true? (Choose two.)
A. You can disable learning on a VLAN to reduce table-space requirements.
B. When you disable learning on a VLAN with an SVI, IP packet flooding in the Layer 2 domain is also disabled.
C. Unicast, multicast, and broadcast MAC address filtering is configured globally and disabled by default.
D. The default setting for static MAC addresses to age out of the MAC address table is 300 seconds.
E. Turning off MAC learning on VLANs 900 through 1005 disables learning on VLANs 900 through 1001.
Answer: A,E
Q12. DRAG DROP
Drag and drop the method for refreshing BGP prefixes on the left to the corresponding description on the right.
Answer:
Q13. Which OSPF feature supports LSA rate limiting in milliseconds to provide faster convergence?
A. LSA throttling
B. incremental SPF
C. fast hello
D. SPF tuning
Answer: A
Explanation:
The OSPF Link-State Advertisement (LSA) Throttling feature provides a dynamic mechanism to slow down link-state advertisement (LSA) updates in OSPF during times of network instability. It also allows faster Open Shortest Path First (OSPF) convergence by providing LSA rate limiting in milliseconds.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/fsolsath.html
Q14. Refer to the exhibit.
What is wrong with the configuration of this tunnel interface?
A. ISATAP tunnels cannot use the EUI-64 address format.
B. No tunnel destination has been specified.
C. The tunnel source of an ISATAP tunnel must always point to a loopback interface.
D. Router advertisements are disabled on this tunnel interface.
Answer: D
Explanation:
Sending of IPv6 router advertisements is disabled by default on tunnel interfaces. This command reenables the sending of IPv6 router advertisements to allow client autoconfiguration:
Example: Router(config-if)# no ipv6 nd ra suppress
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/interface/configuration/xe-3s/ir-xe-3s-book/ip6-isatap-xe.html
Q15. Which attribute is not part of the BGP extended community when a PE creates a VPN-IPv4 route while running OSPF between PE-CE?
A. OSPF domain identifier
B. OSPF route type
C. OSPF router ID
D. MED
E. OSPF network type
Answer: E
Explanation:
By process of elimination, from RFC 4577:
For every address prefix that was installed in the VRF by one of its associated OSPF instances, the PE must create a VPN-IPv4 route in BGP. Each such route will have some of the following Extended Communities attributes:
– The OSPF Domain Identifier Extended Communities attribute. If the OSPF instance that installed the route has a non-NULL primary Domain Identifier, this MUST be present; if that OSPF instance has only a NULL Domain Identifier, it MAY be omitted.
– OSPF Route Type Extended Communities Attribute. This attribute MUST be present. It is encoded with a two-byte type field, and its type is 0306.
– OSPF Router ID Extended Communities Attribute. This OPTIONAL attribute specifies the OSPF Router ID of the system that is identified in the BGP Next Hop attribute. More precisely, it specifies the OSPF Router Id of the PE in the OSPF instance that installed the route into the VRF from which this route was exported.
– MED (Multi_EXIT_DISC attribute). By default, this SHOULD be set to the value of the OSPF distance associated with the route, plus 1.
Reference: https://tools.ietf.org/html/rfc4577