Answers to Practice Exam
417
23.
B. The answer here can be tricky. There are six initialization steps,
but not all of them are always seen. Many times the Loading phase is
not necessary between the Exchange state and the Full state.
24.
B. Route summarization is most effective when used with contiguous
address space, because contiguous address space tends to have the
most higher-order bits in common.
25.
C. The init state is simply the state of receiving Hello packets on the
interface; no adjacencies or other information have been exchanged at
this point.
26.
B. Traffic sent to the virtual interface Null0 is discarded.
27.
C, D. IP unnumbered is not supported on X.25 or SMDS networks.
Since the serial interface has no IP number, you will not be able to ping
the interface to see if it is up. However, you can determine the interface
status with SNMP. Also, IP security options are not supported on an
IP unnumbered interface.
28.
D. Classful routing protocols send no subnet mask information with
the routing updates, so all devices on the network must use the same
subnet mask.
29.
A. The
area-id
parameter in the area area-id virtual-link
router-id
command refers to the ID of the transit area. The transit
area connects the backbone area to the area requiring the virtual link.
30.
D. The
show bgp neighbors
command shows the configured BGP
peers and the current connection status.
31.
C, D, E, F. Alternate path routing, which provides redundancy and
load balancing, along with snapshot routing, tunneling, and dial
backup all provide stability and availability in an
internetwork.
32.
C. Both switches and bridges break up collision domains but are one
large broadcast domain by default. All broadcasts are forwarded to all
network segments with a bridge or switch.
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