Chapter 1 - Self Assessment Flashcards
When Open Shortest Path First (OSPF) starts neighbor negotiations, what setting must match between OSPF neighbors for them to be able to establish adjacencies?
a. Router ID
b. Hello intervals
c. Link cost
d. IP address
B. The area ID, authentication, hello/ dead intervals, stub flag, and maximum transmission unit (MTU) size must match to form OSPF adjacencies.
Which two parameters will assist in designated router (DR) elections?
a. IP Address
b. Router ID
c. Priority
d. Code version
B, C. The router with the highest OSPF priority will be elected as the DR. If there is a tie, the router with the higher ID will be elected as the DR.
Designated router elections occur on which type of network? (Choose two answers.)
a. Point-to-Point
b. Broadcast (Ethernet)
c. NBMA mode
d. Point-to-Multipoint
B, C. When multiple OSPF routers are connected to a multi-access medium such as Ethernet or nonbroadcast multiple access (NBMA), a designated router (DR), and a backup designated router (BDR) are elected. DRs reduce network traffic because only they maintain the complete OSPF database and then send updates to the other routers on the shared network segment.
What are two enhancements that OSPFv3 supports over OSPFv2?
a. It requires the use of ARP.
b. It can support multiple IPv6 subnets on a single link.
c. It supports up to two instances of OSPFv3 over a common link.
d. It routes over links rather than over networks.
B, D. The OSPF IPv6 interface to a link can have more than one IPv6 address. In fact, a single link can belong to multiple subnets, and two interfaces attached to the same link but belonging to different IPv6 subnets can still communicate. OSPFv3 changes the OSPFv2 language of “subnet” to “link” and allows the exchange of packets between two neighbors on the same link but belonging to different IPv6 subnets.
Which statements about IPv6 and routing protocols are true?
a. Link-local addresses are used to form routing adjacencies.
b. OSPFv3 is the only routing protocol that supports IPv6.
c. Loopback addresses are used to form routing adjacencies.
d. MBGP does not support the IPv6 protocol.
A. IPv6 routing uses link-local addresses to form routing adjacencies.
When selecting the best path, the BGP protocol takes into account the following information in the stated order:
a. AS_Path, origin type, multi-exit discriminator, local preference
b. AS_Path, origin type, local preference, multi-exit discriminator
c. Local preference, AS_Path, origin type, multi-exit discriminator
d. Local preference, AS_Path, multi-exit discriminator, origin type
C. BGP path selection 1. Weigh, 2. Local_Pref, 3. Local path, 4. AS_Path, 5. Origin type, 6. multi-exit discriminator (MED), 7. eBGP/ iBGP, 8. Metric.
Which command displays the iBGP and eBGP neighbors that are configured?
a. show ip bgp
b. show ip bgp paths
c. show ip bgp peers
d. show ip bgp summary
D. The show ip bgp summary command displays summarized information about the status of all BGP connections.
What kind of BGP session is established between two routers that are adjacent but in two different autonomous systems?
a. eBGP
b. iBGP
c. dBGP
d. mBGP
A. External BGP (eBGP) is used to establish sessions and exchange route information between two or more autonomous systems. Internal BGP (iBGP) is used by routers that belong to the same autonomous system (AS).
What is a BFD detect multiplier?
a. The interval at which this device wants to send BFD hello messages
b. The minimum interval at which this device can accept BFD hello messages from another BFD device
c. The number of missing BFD hello messages from another BFD device before this local device detects a fault in the forwarding path
d. The time between BFD hello packets
C. A detect multiplier is the number of missing BFD hello messages from another BFD device before this local device detects a fault in the forwarding path.
In Ethernet LANs, what is the functional equivalent to IGMPv3 in IPv6?
a. IGMPv3 includes IPv6 multicast support; that’s why it is v3.
b. MLDv2.
c. MLDv1.
d. IPv6’ s native support for multicast routing deprecates this need.
B. MLDv1 is similar to IGMPv2, and MLDv2 is similar to IGMPv3.
How is multicast RPF checking important when running PIM sparse mode? (Choose two answers.)
a. To prevent multicast source spoofing
b. To prevent receiver spoofing
c. To prevent multicast forwarding loops by validating that the receiving interface is the reverse path to the S address
d. To prevent multicast forwarding loops by validating that the receiving interface is the reverse path of the G address
A, C. In multicast routing, the decision to forward traffic is based on the source address, not on the destination address as in unicast routing.
Which statements about HSRP operation are true? (Choose three answers.)
a. The HSRP default timers are a 3-second hello interval and a 10-second dead interval.
b. HSRP supports only cleartext authentication.
c. The HSRP virtual IP address must be on a different subnet than the routers’ interfaces on the same LAN.
d. The HSRP virtual IP address must be the same as one of the router’s interface addresses on the LAN. HSRP V1 supports up to 255 groups per interface.
A, D, E. The HSRP default hello time is 3 seconds, and the default hold time is 10 seconds. Virtual IP must be on same subnet as the interface IP address. HSRP version 1 supports group numbers from 0 to 255.
Which HSRP feature was new in HSRPv2?
a. Group numbers that are greater than 255
b. Virtual MAC addresses
c. Tracking
d. Preemption
A. In HSRP version 1, group numbers are restricted to the range from 0 to 255. HSRP version 2 expands the group number range from 0 to 4095.
When a router with the highest HSRP priority recovers from failure, which option will ensure that the router immediately becomes the active router?
a. standby preempt
b. standby priority
c. standby tracker
d. standby delay
A. The standby preempt command enables the Hot Standby Router Protocol (HSRP) router with the highest priority to immediately become the active router.
Which statement describes Virtual Router Redundancy Protocol (VRRP) object tracking?
a. It monitors traffic flow and link utilization.
b. It ensures the best VRRP router is the virtual router master for the group.
c. It causes traffic to dynamically move to higher bandwidth links.
d. It thwarts man-in-the-middle attacks.
B. VRRP object tracking provides a way to ensure the best VRRP router is the virtual router master for the group by altering VRRP priorities to the status of tracked objects, such as the interface or IP route states.
