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Answer:
D
Explanation
Below lists the cabling standards mentioned above
Standard
Cabling
Maximum length
1000BASE-
CX
Twinaxial cabling
25 meters
100BASE-FX
Two strands, multimode
400 m
1000BASE-
LX
Long-wavelength laser, MM
or SM fiber
10 km (SM) 3 km (MM)
1000BASE-
SX
Short-wavelength laser, MM
fiber
220 m with 62.5-micron fiber; 550 m
with 50-micron fiber
1000BASE-
ZX
Extended wavelength, SM
fiber
100 km
Note:
+ MM: Multimode
+ SM: Single-mode
Although above list says the maximum length of 1000BASE-ZX is 100km but in practical it is
usually from 70 to 80 km depending on link loss.
Question 107
What is the effect when loopback interfaces and the configured router ID are absent during the
OSPF Process configuration?
A. The router ID 0.0.0.0 is selected and placed in the OSPF process.
B. No router ID is set, and the OSPF protocol does not run.
C. The highest up/up physical interface IP address is selected as the router ID.
D. The lowest IP address is incremented by 1 and selected as the router ID.
Answer:
C
Explanation
OSPF uses the following criteria to select the router ID:
1. Manual configuration of the router ID (via the “router-id x.x.x.x” command under OSPF
router configuration mode).
2. Highest IP address on a loopback interface.
3. Highest IP address on a non-loopback and active (no shutdown) interface.
Question 108
Refer to the exhibit.
What is expected when PC_A sends data to PC_B after their initial communication?
A. The source and destination MAC addresses remain the same
B. The switch rewrites the source and destination MAC addresses with its own
C. The source MAC address is changed
D. The destination MAC address is replaced with ffff.ffff.ffff
Answer:
A
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